0000000001309312

AUTHOR

Rita Meunier-prest

showing 39 related works from this author

Tuning of interfacial charge transport in polyporphine/phthalocyanine heterojunctions by molecular geometry control for an efficient gas sensor

2022

Abstract Owing to high interfacial conductivity, organic heterostructures hold great promises to augment the electrical performances of electronic devices. In this endeavor, the present work reports fabrication of novel polyporphine/phthalocyanine heterostructures and investigates the modulation of charge transport induced by structural change of polyporphine and its implication on ammonia sensing properties. Polyporphines materials are electrosynthesized by oxidation of zinc(II) porphine monomer that corresponds to the fully unsubstituted porphyrin. At less-positive anodic potential, low conducting meso,meso-singly-linked type-1 polymer (pZnP-1) is formed in which a monomer unit stays orth…

chemistry.chemical_classificationMaterials scienceGeneral Chemical EngineeringHeterojunction02 engineering and technologyGeneral ChemistryPolymerConductivity010402 general chemistry021001 nanoscience & nanotechnology01 natural sciencesIndustrial and Manufacturing Engineering0104 chemical sciencesAnodeDielectric spectroscopychemistry.chemical_compoundMonomerMolecular geometrychemistryChemical physicsPhthalocyanineEnvironmental Chemistry[CHIM]Chemical Sciences0210 nano-technologyComputingMilieux_MISCELLANEOUS
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Modulation of the organic heterojunction behavior, from electrografting to enhanced sensing properties

2019

International audience; The energy barrier of an organic heterojunction built on ITO electrodes and made from a low conductive sublayer (Cu(F16Pc)) covered by a highly conductive semiconductor (LuPc2) is modulated by electrografting of organic layers before depositing the sublayer. Impedance spectroscopy clearly demonstrates the increase of the energy barrier at the ITO – sublayer interface. Additionally, the electrografting is a versatile and promising method for the tuning of heterojunctions. The I(V) characteristics of the heterojunctions are highly modified by the electrografting. The same electromodifications of electrodes carried out on LuPc2 resistors lead to a modification of their …

Materials scienceImpedance spectroscopy02 engineering and technology010402 general chemistry01 natural scienceslaw.invention[CHIM.ANAL]Chemical Sciences/Analytical chemistrylawMaterials ChemistryElectrical and Electronic EngineeringInstrumentationElectrical conductorDetection limitOrganic electronicsOrganic electronicsbusiness.industryMetals and AlloysHeterojunction021001 nanoscience & nanotechnologyCondensed Matter PhysicsDiazonium saltsAmmonia sensors[SPI.TRON]Engineering Sciences [physics]/Electronics0104 chemical sciencesSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsDielectric spectroscopyMolecular materialsSemiconductorElectrodeOptoelectronicsResistor[CHIM.OTHE]Chemical Sciences/Other0210 nano-technologybusinessSensors and Actuators B: Chemical
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Direct measurement of the melting temperature of supported DNA by electrochemical method

2003

The development of biosensors based on DNA hybridization requires a more precise knowledge of the thermodynamics of the hybridization at a solid interface. In particular, the selectivity of hybridization can be affected by a lot of parameters such as the single-strand (ss)DNA density, the pH, the ionic strength or the temperature. The melting temperature, T(m), is in part a function of the ionic strength and of the temperature and therefore provides a useful variable in the control of the selectivity and sensitivity of a DNA chip. The electrochemical technique has been used to determine the T(m) values when the probe is tethered by a DNA self-assembled monolayer (SAM). We have built a speci…

Osmolar ConcentrationTemperatureAnalytical chemistryDNABiologyNucleic Acid DenaturationElectrochemistrySensitivity and SpecificityMolecular biologyRedox indicatorIonic strengthMonolayerElectrodeElectrochemistryGeneticsThermodynamicsA-DNASelectivityElectrodesOxidation-ReductionBiosensorNAR Methods OnlineOligonucleotide Array Sequence AnalysisNucleic Acids Research
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Organic Heterojunction Devices Based on Phthalocyanines: A New Approach to Gas Chemosensing.

2020

Organic heterostructures have emerged as highly promising transducers to realize high performance gas sensors. The key reason for such a huge interest in these devices is the associated organic heterojunction effect in which opposite free charges are accumulated at the interface making it highly conducting, which can be exploited in producing highly sensitive and faster response kinetics gas sensors. Metal phthalocyanines (MPc) have been extensively studied to fabricate organic heterostructures because of the large possibilities of structural engineering which are correlated with their bulk thin film properties. Accordingly, in this review, we have performed a comprehensive literature surve…

Materials scienceInsulator (electricity)Review02 engineering and technologyphthalocyanines010402 general chemistrylcsh:Chemical technology01 natural sciencesBiochemistrySignalAnalytical Chemistrylaw.inventionlawSaturation currentheterostucture[CHIM]Chemical Scienceslcsh:TP1-1185Electrical and Electronic EngineeringThin filmInstrumentation[PHYS]Physics [physics]conductometric transducersbusiness.industryTransistorHeterojunction021001 nanoscience & nanotechnologyAtomic and Molecular Physics and Optics0104 chemical sciencesTransducergas sensorsorganic heterojunctionsOptoelectronicstransistorsorganic heterojunction effects0210 nano-technologybusinessLiterature surveySensors (Basel, Switzerland)
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Electrochemical and Spectroelectrochemical Behavior of a Tetracyanotriphenodioxazine in Solution and Thin-Films

2018

International audience; We report the electrochemical behavior of a tetracyano triphenodioxazine bearing two triisopropylsilylethynyl moieties (TiPS‐TPDO‐tetraCN) during its reduction studied either in solution or after vacuum evaporation deposition on indium tin oxide (ITO) support. While in dichloromethane, it typically proceeds in two successive monoelectronic reactions, in acetonitrile, the mechanism appears more complex. Fine analysis of the spectroelectrochemical results combined with simulation of the voltammograms with various amount of water suggest the involvement of water and of a restructured dianion in the electrochemical process. In the solid‐state, the formation of the diprot…

Materials scienceDisproportionation02 engineering and technology010402 general chemistry021001 nanoscience & nanotechnologyElectrochemistryPhotochemistry01 natural sciencesCatalysis0104 chemical sciencesElectrochemistryProton-coupled electron transferThin film0210 nano-technology[CHIM.OTHE]Chemical Sciences/Other
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Photon assisted-inversion of majority charge carriers in molecular semiconductor-based organic heterojunctions

2021

International audience; Ambipolar molecular materials hold great promises as a building block of next generation highly efficient, less complex and low cost electronics devices. In this endeavor, the present work reports the fabrication of organic heterojunction devices based on halogenated copper Phthalocyanines (CuPc) and lutetium bisphthalocyanine (LuPc2) bilayer, investigates their structural and electrical properties and probes the ambipolar behavior by ammonia sensing. Microstructural analysis of the heterostructure thin films revealed compact and semicrystalline organization, depending on the number of halogen substituents in CuPc. The heterojunction devices reveal a non-linear I(V) …

Materials sciencebusiness.industryAmbipolar diffusionHeterojunction02 engineering and technologyGeneral ChemistryElectron010402 general chemistry021001 nanoscience & nanotechnology01 natural sciencesSurface energy0104 chemical sciencesDielectric spectroscopyMaterials ChemistryOptoelectronics[CHIM]Chemical SciencesCharge carrierddc:530Thin film0210 nano-technologybusinessVisible spectrum
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Tuning Of Organic Heterojunction Conductivity By The Substituents' Electronic Effects In Phthalocyanines For Ambipolar Gas Sensors

2021

Abstract Exploiting organic heterojunction effects in electrical devices are an important strategy to improve the electrical conductivity, which can be utilized into improving the conductometric gas sensors performances. In this endeavor, the present article reports fabrication of organic heterostructures in a bilayer device configuration incorporating octa-substituted nickel phthalocyanines (NiPc) and radical lutetium bis-phthalocyanine (LuPc2) and investigates their sensing properties towards NH3 vapor. NiPc having hexyl sulfanyl, hexyl sulfonyl and p-carboxyphenoxy moieties are synthesized, which electronic effects are electron donating, accepting and moderate accepting, respectively, al…

Conductometric TransducerMaterials science02 engineering and technologyConductivity010402 general chemistryPhotochemistry01 natural scienceschemistry.chemical_compoundAmmoniaSulfanylMaterials ChemistryElectronic effect[CHIM]Chemical SciencesElectrical and Electronic EngineeringInstrumentationComputingMilieux_MISCELLANEOUSchemistry.chemical_classificationAmbipolar diffusionBilayerMetals and AlloysPhthalocyanineHeterojunctionElectron acceptor021001 nanoscience & nanotechnologyCondensed Matter Physics0104 chemical sciencesSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsMolecular materialschemistryHeterojunctionCyclic voltammetryGas sensor0210 nano-technology
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Ferrocenyl glycopeptides as electrochemical probes to detect autoantibodies in multiple sclerosis patients' será

2008

Abstract Glycopeptide analogues of CSF114(Glc), modified at N-terminus with new ferrocenyl carboxylic acid and a new ferrocenyl-thiphosphino amino acid, were used to implement a new electrochemical biosensor for autoantibody detection in multiple sclerosis. The ferrocenyl moiety of these "electrochemical probes" did not affect autoantibody recognition both in SP-ELISA and in inhibition experiments. By electrochemical monitoring the interactions of the modified peptides Fc-CSF114(Glc) and 4-FcPhP(S)Abu-CSF114(Glc) with the autoantibodies, we demonstrated that autoantibodies could be detected with a sensitivity comparable to ELISA method. The new electrochemical probes can be proposed to char…

Multiple SclerosisMetallocenesCarboxylic acidBiophysics010402 general chemistry01 natural sciencesBiochemistryBiomaterialsImmunoenzyme Techniques[ CHIM.CATA ] Chemical Sciences/CatalysismedicineElectroanalytical methodElectrochemistryMoietyHumansFerrous CompoundsAntigensComputingMilieux_MISCELLANEOUSAutoantibodieschemistry.chemical_classification010405 organic chemistryChemistryMultiple sclerosisOrganic ChemistryAutoantibodyGlycopeptidesGeneral Medicine[CHIM.CATA]Chemical Sciences/Catalysismedicine.diseaseGlycopeptide0104 chemical sciences3. Good healthAmino acidSolutionsBiochemistryMolecular ProbesGoldCyclic voltammetryChromatography Liquid
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Conducting Polymers for Ammonia Sensing: Electrodeposition, Hybrid Materials and Heterojunctions

2017

International audience; Polyaniline (PANI) with electrodonating and electrowithdrawing substituents were electrodeposited and studied as sensing materials in resistors and heterojunctions. Whereas the dimethoxyaniline leads to a highly conductive material, the tetrafluoroaniline leads to a poor conducting polymer. However, this latter was used in heterojunctions, associated with a highly conductive material, the lutetium bisphthalocyanine LuPc2. Elsewhere, hybrid materials combining polypyrrole (PPy) with ionic macrocycles as counterions were also electrosynthesized and used as sensing material in resistors, for the detection of ammonia. They exhibit a higher sensitivity compared to PPy pre…

Materials scienceheterojunctionInorganic chemistryIonic bondinglcsh:A02 engineering and technology010402 general chemistryPolypyrrole01 natural sciencesammonialaw.inventiongas sensorchemistry.chemical_compoundlawPolyanilineconducting polymerConductive polymerchemistry.chemical_classificationhumidityHeterojunction021001 nanoscience & nanotechnology0104 chemical sciences[ CHIM.POLY ] Chemical Sciences/Polymers[CHIM.POLY]Chemical Sciences/PolymerschemistryResistorCounterionlcsh:General Works0210 nano-technologyHybrid material
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Electrochemistry of methylene blue at an alkanethiol modified electrode

2012

International audience; Gold surfaces were derivatized with decanethiol. The electrochemistry of methylene blue at these modified electrodes was investigated in function of the gold cleaning process and compared with the results obtained at a bare gold electrode. Cyclic voltammetry at low methylene blue concentrations (c(MB) <= 16 mu M) yielded surface behavior data. The properties of the film vary with the electrode pretreatment. Without electrochemical cleaning step, the standard potential at a gold electrode modified with 1-decanethiol is nearly the same as on a bare gold electrode. On the other hand, when the electrode is electrochemically cleaned before adsorption of the alkanethiols, …

General Chemical EngineeringInorganic chemistry02 engineering and technologyPRETREATMENT010402 general chemistryElectrochemistry01 natural sciencesMODIFIED GOLD ELECTRODESchemistry.chemical_compoundAdsorptionSELF-ASSEMBLED MONOLAYERSMonolayerElectrochemistrySURFACESTHIOL MONOLAYERSSelf-assembled monolayerIMPEDANCE SPECTROSCOPYDNA021001 nanoscience & nanotechnology0104 chemical sciencesPOLYCRYSTALLINE GOLDchemistryStandard electrode potentialElectrodeCYCLIC VOLTAMMETRYCyclic voltammetry0210 nano-technologyMethylene blueREDUCTIVE DESORPTION
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Mass Transport in Nanoporous Gold and Correlation with Surface Pores for EC 1 Mechanism: Case of Ascorbic Acid

2021

International audience; Entry for the Table of Contents Playing with the pores: Surface pores size in nanoporous gold modulates the electrode reactions pathways of ascorbic acid. The reaction is largely driven by diffusion when pores are smaller (nanometer). On the contrary, adsorption holds the key role when pores are bigger (micrometer), allowing permeation of molecules in the film volume.

Mass transportMaterials scienceELETROQUÍMICANanoporous02 engineering and technology010402 general chemistry021001 nanoscience & nanotechnologyElectrochemistryAscorbic acid01 natural sciencesCatalysis0104 chemical sciencesChemical engineeringElectrochemistry[CHIM]Chemical Sciences0210 nano-technologyMechanism (sociology)ChemElectroChem
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Molecular Engineering of Porphyrin‐Tapes/Phthalocyanine Heterojunctions for a Highly Sensitive Ammonia Sensor

2020

International audience; Modulating the interfacial charge alignments by molecular engineering in an organic heterojunction device is a smart strategy to improve its conductivity, which can be exploited in high performance gas sensors development. Herein, the fabrication of new organic heterojunction devices based on porphyrin tapes and phthalocyanines and their potentiality in ammonia sensing at different relative humidity (rh) are investigated. The devices are built using dry approach relying on oxidative chemical vapor deposition for simultaneous synthesis, doping and deposition of the porphyrin tape layer and physical vapor deposition of phthalocyanine layer. The association of the porph…

PorphyrinsMaterials scienceSensorsPhthalocyaninesHeterojunction[CHIM.MATE]Chemical Sciences/Material chemistry02 engineering and technology010402 general chemistry021001 nanoscience & nanotechnologyPhotochemistry01 natural sciencesPorphyrin0104 chemical sciencesElectronic Optical and Magnetic MaterialsHighly sensitiveMolecular engineeringAmmoniachemistry.chemical_compoundchemistryAmmonia[CHIM.ANAL]Chemical Sciences/Analytical chemistryHeterojunctionsPhthalocyanine0210 nano-technologyAdvanced Electronic Materials
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Potential-assisted deposition of mixed alkanethiol self-assembled monolayers

2010

Abstract Preparation of self-assembled monolayers (SAMs) usually involves passive incubation. The recently developed potential-assisted deposition is indeed more selective as well as 100-fold faster than passive adsorption, thereby enhancing the reproducibility of the monolayer deposition. This article aims to identify the electrodeposition conditions necessary to prepare mixed alkanethiol SAMs on gold surface. Parameters such as concentrations in solution, electrode polarization and deposition time were examined for two chain lengths, C 3 (mercaptopropionic acid, MPA) and C 18 (octadecanethiol, ODT). The kinetics and composition of the SAMs were systematically characterized by reductive st…

reductive desorptionGeneral Chemical EngineeringAnalytical chemistry02 engineering and technology010402 general chemistry01 natural sciencesAdsorptionEllipsometryDesorption[ CHIM.OTHE ] Chemical Sciences/OtherMonolayerDeposition (phase transition)oxidative adsorptionSurface plasmon resonanceComputingMilieux_MISCELLANEOUSChemistrySelf-assembled monolayer021001 nanoscience & nanotechnologybinary SAMs0104 chemical scienceselectrochemistrySelf-assembly0210 nano-technology[CHIM.OTHE]Chemical Sciences/Othersurface plasmon resonanceellipsometry
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Proton coupled electron transfer of ubiquinone Q2 incorporated in a self-assembled monolayer.

2011

We present a complete study of the reduction of ubiquinone Q(2) (UQ(2)) in simpler aqueous medium, over a pH range of 2.5 to 12.5. The short isoprenic chain ubiquinones (UQ(2)) were incorporated in a self-assembled monolayer. Under these conditions, the global 2e(-) electrochemical reaction can be described on the basis of a nine-member square scheme. The thermodynamic constants of the system were determined. The global 2e(-) process is controlled by the uptake of the second electron. The elementary electrochemical rate constants obtained by fitting of the experimental rate constant were k(s4) = 1.5 s(-1) for QH˙(+)(2)↔ QH(2), k(s5) = 1.5 s(-1) for QH˙↔ QH(-) and k(s6) = 1 s(-1) for Q˙(-)↔ …

Aqueous mediumChemistrySurface PropertiesUbiquinoneAnalytical chemistryGeneral Physics and AstronomyWaterSelf-assembled monolayerElectronHydrogen-Ion ConcentrationElectrochemistryElectron TransportReaction rate constantCoenzyme Q – cytochrome c reductaseMonolayerElectrochemistryThermodynamicsGoldPhysical and Theoretical ChemistryProton-coupled electron transferProtonsOxidation-ReductionPhysical chemistry chemical physics : PCCP
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Alkylthio-tetrasubstituted μ-Nitrido Diiron Phthalocyanines: Spectroelectrochemistry, Electrical Properties, and Heterojunctions for Ammonia Sensing.

2020

Alkylthio-tetrasubstituted μ-nitrido diiron phthalocyanine complexes are synthesized with n-butyl, iso-butyl, tert-butyl, and n-hexadecyl alkyl moieties. For the first time, a spectroelectrochemical investigation of μ-nitrido diiron phthalocyanines is achieved at all the redox steps. The complexes are stable in all their redox states, unlike their unsubstituted analogues. The interest of the present complexes is to prepare sensing devices by a solution processing method. Films are characterized by electronic absorption and Raman spectroscopies. Electrical measurements on resistors show the highly resistive behavior of these complexes, whatever the chain length. However, when combined with t…

heterojunctionchemistry.chemical_element010402 general chemistryPhotochemistry01 natural sciencesRedoxammoniagas sensorInorganic Chemistrychemistry.chemical_compoundsymbols.namesake[CHIM]Chemical SciencesElectrical measurementsconductometric transducerPhysical and Theoretical Chemistrymolecular materialsAlkylComputingMilieux_MISCELLANEOUSchemistry.chemical_classification010405 organic chemistryIntrinsic semiconductorHeterojunctionLutetium0104 chemical sciencesphthalocyaninechemistryPhthalocyaninesymbolsRaman spectroscopyInorganic chemistry
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Series of charge transfer complexes obtained as crystals in a confined environment

2021

A series of charge transfer complexes (CTCs) were successfully formed by solvent free processing techniques, using the 1,2,4,5-tetracyano benzene (TCNB) as πA molecule and a series of p-dihydroquinones (H2Qs) as πD counterparts. Additionally to the classical co-evaporation techniques, we obtained CTCs in less than an hour, in a very simple confined environment, between two 100 μm – spaced glass plates. A systematical study by Raman spectroscopy on crystals highlighted the CTCs formation. Moreover, three new crystalline structures were obtained, namely TCNB-H2Q that crystallizes in columns connected to each other by H-bonds, while with the methoxy- and dimethoxy-H2Qs the CTC forms crystals w…

Materials scienceHydrogen bondIntermolecular force02 engineering and technologyGeneral Chemistry010402 general chemistry021001 nanoscience & nanotechnologyCondensed Matter Physics01 natural sciences0104 chemical scienceschemistry.chemical_compoundsymbols.namesakeCrystallographychemistrysymbols[CHIM]Chemical SciencesMoleculeGeneral Materials ScienceAbsorption (chemistry)van der Waals force0210 nano-technologyBenzeneRaman spectroscopyStoichiometryCrystEngComm
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Electrochemical detection of the 2-isobutyl-3-methoxypyrazine model odorant based on odorant-binding proteins: The proof of concept

2014

Abstract We developed an electrochemical assay for the detection of odorant molecules based on a rat odorant-binding protein (rOBP3). We demonstrated that rOBP3 cavity binds 2-methyl-1,4-naphtoquinone (MNQ), an electrochemical probe, as depicted from the decrease of its electrochemical signal, and deduced the dissociation constant, Kd MNQ  = 0.5(± 0.2) μM. The amount of MNQ displaced from rOBP3 by 2-isobutyl-3-methoxypyrazine (IBMP), a model odorant molecule, was measured using square-wave voltammetry. The release of MNQ by competition led to an increase of the electrochemical response. In addition, this method allowed determination of the dissociation constant of rOBP3 for IBMP, Kd IBMP  =…

Models MolecularIsothermal microcalorimetryOdorant bindingBiophysicsAnalytical chemistryCalorimetryReceptors OdorantElectrochemistryBinding CompetitiveCaffeic AcidsElectrochemistryPhysical and Theoretical ChemistryVoltammetryBinding SitesChemistryVitamin K 3Electrochemical TechniquesGeneral MedicineCombinatorial chemistryFluorescenceRecombinant ProteinsDissociation constantImmobilized ProteinsSpectrometry FluorescencePyrazinesCalibrationTitrationBiosensorBioelectrochemistry
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In situ spectroelectrochemical study of the reductive coupling of benzaldehyde catalyzed by Ti(III) complexes in the presence of Mg(II)

2003

Abstract The UV–vis spectroelectrochemical technique has been used to visualize for the first time, the formation of a trimetallic intermediate Ti(III)Mg(II)Ti(III) during the reductive coupling of benzaldehyde in the presence of electrogenerated Ti(III) and MgCl 2 . This intermediate is supposed to induce the high diastereoselectivity of the reaction. We have built a special thin layer cell adapted from the scheme proposed by A. Neudeck and L. Dunsch [‘J. Electroanal. Chem. 370 (1994) 17; J. Electroanal. Chem. 386 (1995) 135’] which allows the simultaneous recording of the cyclic voltammogram and of a great quantity of UV–vis spectra at a frequency of 1 spectrum per second by means of a …

Reaction mechanismChemistryMagnesiumGeneral Chemical Engineeringchemistry.chemical_elementElectrochemistryPhotochemistryAnalytical ChemistryCatalysisReaction rateBenzaldehydechemistry.chemical_compoundReaction rate constantElectrochemistryPhysical chemistryCyclic voltammetryJournal of Electroanalytical Chemistry
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Low Conductive Electrodeposited Poly(2,5-dimethoxyaniline) as a Key Material in a Double Lateral Heterojunction, for Sub-ppm Ammonia Sensing in Humid…

2019

We present a new device called a double lateral heterojunction (DLH) as an ammonia sensor in humid atmosphere. It combines polyaniline derivatives in their poor conducting state with a highly conductive molecular material, lutetium bisphthalocyanine, LuPc2. Polyaniline and poly(2,5-dimethoxyaniline) are electrodeposited on ITO interdigitated electrodes, leading to an original device that can be obtained only by electrochemistry and not by other solution processing techniques. Both polymers lead to highly conducting materials that require a neutralization step before their coverage by LuPc2. While the device based on polyaniline shows ohmic behavior, the nonlinear I- V characteristics of the…

Materials sciencePolymersBioengineering02 engineering and technologyElectrochemistry01 natural scienceschemistry.chemical_compoundAmmoniaLimit of DetectionPolyaniline[CHIM]Chemical SciencesInstrumentationOhmic contactElectrical conductorComputingMilieux_MISCELLANEOUSFluid Flow and Transfer ProcessesConductive polymerchemistry.chemical_classificationAniline Compoundsbusiness.industryProcess Chemistry and Technology010401 analytical chemistryElectric ConductivityHumidityHeterojunctionPolymer021001 nanoscience & nanotechnologyElectroplating0104 chemical sciencesDielectric spectroscopySemiconductorschemistryOptoelectronics0210 nano-technologybusiness
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[60]Fullerene l -Amino Acids and Peptides: Synthesis under Phase-Transfer Catalysis Using a Phosphine–Borane Linker. Electrochemical Behavior

2017

International audience; A new method to link amino acid and peptide derivatives to [60]fullerene is described. It uses hydrophosphination with a secondary phosphine borane. First, the stereoselective synthesis of secondary phosphine borane amino acid derivatives was achieved by alkylation of phenylphosphine borane with gamma-iodo-alpha-amino ester reagents under phase transfer catalysis (PTC). Second, a sec-phosphine borane amino ester was saponified and coupled with alpha,gamma-diamino esters to afford the corresponding dipeptide derivatives in good yields. Finally, the hydrophosphination reaction of [60]fullerene by the sec-phosphine borane compounds was performed under PTC to obtain C-60…

p-chiral phosphiniteshiv-1 proteaseBoraneAlkylation010402 general chemistrychemistry01 natural scienceschemistry.chemical_compoundc60[ CHIM.ORGA ] Chemical Sciences/Organic chemistryredox propertiesOrganic chemistrytertiary phosphinesRacemizationchemistry.chemical_classificationAddition reactionbond activationDipeptide010405 organic chemistry[CHIM.ORGA]Chemical Sciences/Organic chemistryOrganic ChemistrybuckminsterfullereneCombinatorial chemistryfullerene c-600104 chemical sciencesAmino acidchemistryPhenylphosphinederivativesPhosphine
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New n-type molecular semiconductor–doped insulator (MSDI) heterojunctions combining a triphenodioxazine (TPDO) and the lutetium bisphthalocyanine (Lu…

2018

International audience; Molecular semiconductor–doped insulator (MSDI) heterojunctions were designed using a new family of sublayers, namely triphenodioxazines (TPDO). The device obtained by combining the tetracyano triphenodioxazine bearing two triisopropylsilylethynyl moieties as a sublayer with the lutetium bisphthalocyanine (LuPc2) as a top layer showed a nonlinear current–voltage characteristic independent of the sign of the polarization, which is the signature of MSDI heterojunctions. Thus, a TPDO was used in a chemical sensor for the first time. Despite LuPc2 being the only material exposed to the atmosphere, the positive response of the device under ammonia revealed the key role pla…

Analytical chemistrychemistry.chemical_element02 engineering and technology010402 general chemistryConductometric transducer01 natural sciencesAmmoniachemistry.chemical_compoundMolecular semiconductorAmmonia[CHIM.ANAL]Chemical Sciences/Analytical chemistryMaterials ChemistryTriphenodioxazineElectrical and Electronic EngineeringMolecular materialsInstrumentationChemistrybusiness.industryDopingMetals and AlloysHeterojunction021001 nanoscience & nanotechnologyCondensed Matter PhysicsLutetiumChemical sensor0104 chemical sciencesSurfaces Coatings and FilmsElectronic Optical and Magnetic Materials[SPI.TRON]Engineering Sciences [physics]/ElectronicsMolecular materialsPositive responseHeterojunctionsOptoelectronics0210 nano-technologybusiness
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The reduction mechanism of the CO group.

2001

A detailed study of the electrochemical reduction of benzil in aqueous medium between H0=−5 and pH 11 is presented. A global 2e−, 3H+ or 2e−, 2H+ surface reaction leads to cis and trans endiols. Analysis, using the theory of the square schemes with protonations at equilibrium, shows that in all the pH range the reaction is controlled by the second electron uptake, the paths being successively H+, e− and e−, H+. The electrochemical reaction is followed by surface isomerizations whose rate constants vary from 7 to 200 s−1 for the trans/cis and from 1 to 2000 s−1 for the cis/trans transformations.

DiketoneReaction mechanismAqueous solution010405 organic chemistryStereochemistryGeneral Chemical Engineering010402 general chemistryElectrochemistry01 natural sciencesCis trans isomerization0104 chemical scienceschemistry.chemical_compoundReaction rate constantchemistryElectrochemistryPhysical chemistryBenzilCis–trans isomerismElectrochimica Acta
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Modulating the Electrical Properties of Organic Heterojunction Devices Based On Phthalocyanines for Ambipolar Sensors.

2020

International audience; HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

Materials scienceIndolesBioengineering02 engineering and technologyIsoindoles01 natural sciencesMolecular semiconductor[CHIM.ANAL]Chemical Sciences/Analytical chemistryAmmonia[CHIM.COOR]Chemical Sciences/Coordination chemistryMolecular materialsInstrumentationFluid Flow and Transfer ProcessesOrganic electronicsAmbipolar diffusionbusiness.industryProcess Chemistry and TechnologyBilayer010401 analytical chemistryWaterHeterojunctionHumidity021001 nanoscience & nanotechnology0104 chemical sciencesOptoelectronics0210 nano-technologybusinessACS sensors
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DNA nanofilm thickness measurement on microarray in air and in liquid using an atomic force microscope.

2005

International audience; The measurement of the thickness of DNA films on microarray as a function of the medium (liquid, air) is gaining importance for understanding the signal response of biosensors. Thiol group has been used to attach DNA strands to gold micropads deposited on silicon surface. Atomic force microscopy (AFM) was employed in its height mode to measure the change in the pad thickness and in its force mode to measure the indentation depth of the nanofilm. A good coherence between the height and force modes is observed for the film thickness in air. The adhesion force was found to be an alternative way to measure the surface coverage of the biolayer at nanoscopic scale. However…

MESH : Membranes ArtificialMESH: Materials TestingMESH : DNAMESH : Nucleic Acid ConformationAnalytical chemistryTissue Adhesions02 engineering and technologyMicroscopy Atomic Force01 natural sciencesCoated Materials BiocompatibleMESH: Coated Materials BiocompatibleIndentationMESH : Particle SizeMicroscopyMaterials TestingMESH : Coated Materials BiocompatibleElectrochemistryMESH : SolutionsMESH : Surface PropertiesComposite materialOligonucleotide Array Sequence AnalysisMESH: Microscopy Atomic ForceChemistryAirMESH: DNAGeneral Medicine021001 nanoscience & nanotechnologySolutionsMESH : Oligonucleotide Array Sequence AnalysisMembraneMESH: Nucleic Acid ConformationMESH : AirMESH: Membranes Artificial0210 nano-technologyBiotechnologySiliconSurface PropertiesBiomedical EngineeringBiophysicschemistry.chemical_elementMESH: Solutions010402 general chemistryMESH : Materials TestingAdsorptionMESH : Adsorption[SDV.BBM]Life Sciences [q-bio]/Biochemistry Molecular BiologyMESH: Particle SizeParticle SizeNanoscopic scale[ SDV.BBM ] Life Sciences [q-bio]/Biochemistry Molecular BiologyMESH: Surface PropertiesMembranes ArtificialDNAMESH : Microscopy Atomic Force0104 chemical sciencesMESH : Tissue AdhesionsMESH: AirMESH: Oligonucleotide Array Sequence AnalysisNucleic Acid ConformationParticle sizeAdsorptionMESH: Tissue AdhesionsMESH: AdsorptionBiosensor
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Comprehensive Study of Poly(2,3,5,6-tetrafluoroaniline): From Electrosynthesis to Heterojunctions and Ammonia Sensing.

2018

In this work, we report for the first time on a comprehensive study of poly(2,3,5,6-tetrafluoroaniline) (PTFANI). Contrary to the nonfluorinated polyaniline (PANI) or its analogues bearing one fluorine atom, PTFANI is a poorly conductive material. We present a comprehensive study of the electrosynthesized PTFANI from its monomer in an acidic aqueous medium. PTFANI was fully characterized by a potential-pH diagram, spectroelectrochemistry, and electrochemical quartz crystal microbalance (EQCM) measurements, as well as by a morphological study. Combined with the X-ray photoelectron spectroscopy (XPS) analysis, it allowed us to understand the redox properties of this polymer compared to those …

Conductive polymerMaterials scienceInorganic chemistry02 engineering and technologyQuartz crystal microbalance010402 general chemistry021001 nanoscience & nanotechnologyElectrosynthesisElectrochemistry01 natural sciencesRedox0104 chemical scienceschemistry.chemical_compoundElectron transferchemistryX-ray photoelectron spectroscopyPolyaniline[CHIM]Chemical SciencesGeneral Materials Science0210 nano-technologyComputingMilieux_MISCELLANEOUSACS applied materialsinterfaces
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Synthesis of organometallic glycopeptides and electrochemical studies to detect autoantibodies in multiple sclerosis patients' sera

2009

Feliciana Real-Fernandez, Amelie Chamois-Colson, Jerome Bayardon, Francesca Nuti, Elisa Peroni, Maria R. Moncelli, Rita Meunier-Prest, Sylvain Juge and Anna Maria Papini Laboratory of Peptide & Protein Chemistry & Biology, Polo Scientifico, University of Florence, I-50019 Sesto Fiorentino (FI), Italy; Laboratoire de Synthese et d’Electrosynthese Organometalliques (LSEO), Universite de Bourgogne, 21068, Dijon, France

autoantibodiesPeptideProtein chemistrymultiple sclerosis03 medical and health sciences0302 clinical medicinebloodmedicineProtein antigen030304 developmental biologychemistry.chemical_classification0303 health sciencesMultiple sclerosisAutoantibodyglycopeptides[ SDV.SPEE ] Life Sciences [q-bio]/Santé publique et épidémiologiemedicine.diseaseMolecular biologyGlycopeptide3. Good healthchemistryelectrochemistryImmunology[SDV.SPEE]Life Sciences [q-bio]/Santé publique et épidémiologieenzyme-linked immunosorbent assay030217 neurology & neurosurgery
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Measurements of thickness dispersion in biolayers by scanning force microscopy and comparison with spectroscopic ellipsometry analysis.

2007

Measuring the thickness of biological films remains a difficult task when using differential measurements by atomic force microscopy (AFM). The use of microstructured substrates combined with a selective adsorption constitutes an alternative to tribological measurements. The statistical thickness analysis of biological layers, especially via the dispersion measurements, can provide a way to quantify the molecular orientation. AFM thicknesses were then compared with those obtained optically by spectroscopic ellipsometry (SE) and surface plasmon resonance enhanced ellipsometry (SPREE). The biolayers could then be modeled using a vertical gradient of optical index, which reflects height disper…

Materials scienceAnalytical chemistry02 engineering and technology010402 general chemistryMicroscopy Atomic Force01 natural sciencesEllipsometryMicroscopySurface plasmon resonanceInstrumentationComputingMilieux_MISCELLANEOUSbusiness.industrySelf-assembled monolayerMembranes ArtificialDNATribologySurface Plasmon Resonance021001 nanoscience & nanotechnologyAtomic and Molecular Physics and Optics0104 chemical sciencesElectronic Optical and Magnetic MaterialsMembraneself-assembled monolayerSelective adsorptionOptoelectronicsAFM0210 nano-technologybusinessDispersion (chemistry)ellipsometryheightUltramicroscopy
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Proton Transfer versus Hydrogen Bonding: The Reduction of Ubiquinone Q2Incorporated in a Self-Assembled Monolayer in Unbuffered Aqueous Solution

2014

The electrochemical reduction of ubiquinone Q2 (UQ2) in unbuffered aqueous media was investigated over a pH range of 2 to 11, and the results were compared to those obtained in our previous work in buffered solutions. The short isoprene chains of UQ2 were incorporated in a self-assembled monolayer. Analysis of the mechanism and a study in D2O solutions allowed us to demonstrate the important role of hydrogen bonding in the stabilization of the reduced species, also in water. If the concentration of H+ is low relative to that of the quinone, the electrochemical reaction does not proceed through proton-coupled electron transfer, as it does in buffered medium or at low pH values (pH<4.4). We p…

Aqueous solutionHydrogenHydrogen bondInorganic chemistrychemistry.chemical_elementPhotochemistryElectrochemistryTautomerCatalysischemistry.chemical_compoundElectron transferchemistryMonolayerElectrochemistryIsopreneChemElectroChem
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Electrochemical probe for the monitoring of DNA-protein interactions.

2010

Self-assembly of thiol-terminated oligonucleotides on gold substrates provides a convenient way for DNA-functionalized surfaces. Here we describe the development of an electrochemical assay for the detection of DNA-protein interactions based on the modification of the electrochemical response of methylene blue (MB) intercalated in the DNA strands. Using a functionalized electrode with double stranded DNA carrying T3 RNA polymerase binding sequence, we show a substantial attenuation of the current upon the DNA-protein interaction. Moreover, a Langmuir binding isotherm for T3 RNA polymerase (T3 Pol) gives a dissociation constant K(D) equal to 0.46+/-0.23 microM. Such value is 100 times lower …

Biomedical EngineeringBiophysicsBiosensing TechniquesIn Vitro Techniqueschemistry.chemical_compoundViral ProteinsElectrochemistrymedicineT7 RNA polymeraseAnimalsBovine serum albuminBinding sitePromoter Regions Geneticchemistry.chemical_classificationBinding SitesbiologyBase SequenceOligonucleotideProteinsSerum Albumin BovineGeneral MedicineDNADNA-Directed RNA PolymerasesElectrochemical TechniquesMolecular biologyDissociation constantMethylene BlueEnzymechemistryDNA Viralbiology.proteinBiophysicsCattleGoldMethylene blueDNABiotechnologymedicine.drugBiosensorsbioelectronics
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Electrochemical and DFT studies of the oxidative decomposition of the trihydride complexes Cp*M(dppe)H3 (M = Mo, W) in acetonitrile

2006

International audience; A detailed electrochemical study of the oxidative decomposition of the trihydride complexes Cp*M(dppe)H3 (M = Mo, W) in acetonitrile is presented. For the Mo complex, the decomposition occurs by four different pathways involving classical and non-classical tautomers, whereas only the classical form is accessible for the W derivative. Each of the decomposition pathways has been quantitatively assessed by analyses of the linear sweep voltammograms. In addition to the previously established (B. Pleune, D. Morales, R. Meunier-Prest, P. Richard, E. Collange, J. C. Fettinger and R. Poli, J. Am. Chem. Soc., 1999, 121, 2209–2225) deprotonation, disproportionation, and H2 red…

StereochemistryDisproportionation010402 general chemistryElectrochemistry01 natural sciencesMedicinal chemistryDFTCatalysisReductive eliminationTungstenchemistry.chemical_compoundDeprotonationComplexMaterials Chemistrypentamethylcyclopentadienyl[CHIM.COOR]Chemical Sciences/Coordination chemistryAcetonitrileComputingMilieux_MISCELLANEOUSMolybdenumPhenylphosphinoethane010405 organic chemistryChemistry[ CHIM.COOR ] Chemical Sciences/Coordination chemistryGeneral ChemistryAssociative substitutionRate-determining stepTautomer0104 chemical sciences[CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistryTrihydridoPentamethylcyclopentadienyl ligand
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p -Type and n -type conductometric behaviors of octachloro-metallophthalocyanine-based heterojunctions, the key role of the metal

2020

In the present work, we determined the electrical properties of octachlorinated metallophthalocyanines with Co(II) and Cu(II) ions as metal centers. We engaged them in heterojunctions, with lutetium bisphthalocyanine as a partner. Surprisingly, cobalt and copper complexes show opposite behaviors, the first being an [Formula: see text]-type material whereas the latter is a [Formula: see text]-type material, as deduced from the response of the heterojunctions towards ammonia; showing the unusual key role played by the metal center. While the LuPc[Formula: see text]/Cu(Cl[Formula: see text]Pc) complex exhibits a negative response to ammonia, the LuPc[Formula: see text]/Co(Cl[Formula: see text…

Heterojunction02 engineering and technologyGeneral Chemistry010402 general chemistry021001 nanoscience & nanotechnology01 natural sciences0104 chemical sciencesIonMetalAmmoniachemistry.chemical_compoundchemistryMolecular semiconductorvisual_artvisual_art.visual_art_mediumPhysical chemistry[CHIM]Chemical Sciences0210 nano-technologyComputingMilieux_MISCELLANEOUS
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On the interest of ambipolar materials for gas sensing

2017

International audience; Based on the electrochemical properties of a series of metallophthalocyanines this article shows that the phthalocyanine bearing four alkoxy groups and twelve fluorine atoms behaves approximately as those with eight fluorine atoms. This indicates that the electron-donating effect of one alkoxy group balances the electro-withdrawing effect of one fluorine atom. We engaged three metallophthalocyanines, namely the octafluoro copper phthalocyanine, Cu(F8Pc), an octaester metallophthalocyanine and a phthalocyanine bearing four alkoxy groups and twelve fluorine atoms, Zn(T4F12Pc), in building original conductometric transducers that are Molecular Semiconductor – Doped Insu…

Inorganic chemistrychemistry.chemical_element02 engineering and technology010402 general chemistryElectrochemistry01 natural sciences[ CHIM ] Chemical Scienceschemistry.chemical_compoundMaterials Chemistry[CHIM]Chemical SciencesElectrical and Electronic EngineeringInstrumentationChemistryAmbipolar diffusionDopingMetals and AlloysHeterojunction021001 nanoscience & nanotechnologyCondensed Matter PhysicsLutetium0104 chemical sciencesSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsAlkoxy groupFluorinePhthalocyanine0210 nano-technology
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A biometic olfactory based biosensor combining electrochemistry and odorant-binding

2012

A biometic olfactory based biosensor combining electrochemistry and odorant-binding. Food Factory 2012

[SDV.AEN] Life Sciences [q-bio]/Food and Nutritionalimentationfood intakemusculoskeletal neural and ocular physiology[ SDV.AEN ] Life Sciences [q-bio]/Food and Nutritiondigestive oral and skin physiologytechnology industry and agriculturemacromolecular substances[SDV.AEN]Life Sciences [q-bio]/Food and Nutritionpsychological phenomena and processesolfaction
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β-Aminobutyric Acid (BABA)-Induced Resistance in Arabidopsis thaliana: Link with Iron Homeostasis

2014

International audience; Bêta-Aminobutyric acid (BABA) is a nonprotein amino acid inducing resistance in many different plant species against a wide range of abiotic and biotic stresses. Nevertheless, how BABA primes plant natural defense reactions remains poorly understood. Based on its structure, we hypothesized and confirmed that BABA is able to chelate iron (Fe) in vitro. In vivo, we showed that it led to a transient Fe deficiency response in Arabidopsis thaliana plants exemplified by a reduction of ferritin accumulation and disturbances in the expression of genes related to Fe homeostasis. This response was not correlated to changes in Fe concentrations, suggesting that BABA affects the…

Physiology[SDV]Life Sciences [q-bio]IronMetaboliteArabidopsisPlant ImmunityBiologyIron Chelating AgentsAminobutyric acidERWINIA-CHRYSANTHEMI INFECTIONchemistry.chemical_compoundMetabolomicsGene Expression Regulation Plant[SDV.BV]Life Sciences [q-bio]/Vegetal BiologyHomeostasisMetabolomicsFERRITIN SYNTHESISBOTRYTIS-CINEREATOMATO PLANTSGeneDisease ResistancePlant DiseasesBotrytis cinereachemistry.chemical_classificationAminobutyratesfungifood and beveragesGeneral Medicinebiology.organism_classificationPLANT IMMUNITYDL-3-AMINOBUTYRIC ACIDAmino acidPlant LeavesFerritinPhenotypeBiochemistrychemistryCHELATE REDUCTASESeedlingsDEFENSE RESPONSES[SDE]Environmental Sciencesbiology.proteinPHYTOPHTHORA-INFESTANSBotrytisREFERENCE GENESAgronomy and Crop ScienceMolecular Plant-Microbe Interactions®
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Performance of interdigitated nanoelectrodes for electrochemical DNA biosensor.

2003

An electrochemical methodology for bio-molecule sensing using an array of well-defined nanostructures is presented. We describe the fabrication by e-beam lithography of nanoelectrodes consisting of a 100 micro m x 50 micro m area containing interdigitated electrodes of 100 nm in width and interelectrode distance of 200 nm. Sensitivity and response time of the nanoelectrodes are compared to the responses of macro- and microelectrodes. The specificity of the sensor is studied by modifying the gold electrodes with DNA. The technique enables to characterize both single and double-stranded DNA of 15 nucleotides. A special electrochemical cell is adapted to control the temperature and measure the…

ChemistryDNA Single-StrandedNucleic Acid HybridizationNanotechnologyBiosensing TechniquesElectrochemistryAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic MaterialsElectrochemical cellMicroelectrodeElectrodeElectrochemistryAdsorptionGoldInstrumentationLithographyBiosensorVoltammetryMicroelectrodesElectron-beam lithographyUltramicroscopy
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CCDC 1994293: Experimental Crystal Structure Determination

2021

Related Article: Ali Sanda Bawa, Rita Meunier-Prest, Yoann Rousselin, Jean-Pierre Couvercelle, Christine Stern, Bernard Malézieux, Marcel Bouvet|2021|CrystEngComm|23|6418|doi:10.1039/D1CE00929J

benzene-1245-tetracarbonitrile p-hydroquinoneSpace GroupCrystallographyCrystal SystemCrystal StructureCell ParametersExperimental 3D Coordinates
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CCDC 2063384: Experimental Crystal Structure Determination

2021

Related Article: Ali Sanda Bawa, Rita Meunier-Prest, Yoann Rousselin, Jean-Pierre Couvercelle, Christine Stern, Bernard Malézieux, Marcel Bouvet|2021|CrystEngComm|23|6418|doi:10.1039/D1CE00929J

Space GroupCrystallographybenzene-1245-tetracarbonitrile bis(2-methoxy-p-hydroquinone)Crystal SystemCrystal StructureCell ParametersExperimental 3D Coordinates
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CCDC 1994294: Experimental Crystal Structure Determination

2021

Related Article: Ali Sanda Bawa, Rita Meunier-Prest, Yoann Rousselin, Jean-Pierre Couvercelle, Christine Stern, Bernard Malézieux, Marcel Bouvet|2021|CrystEngComm|23|6418|doi:10.1039/D1CE00929J

Space GroupCrystallographyCrystal SystemCrystal StructureCell Parametersbenzene-1245-tetracarbonitrile bis(26-dimethoxy-p-hydroquinone)Experimental 3D Coordinates
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CCDC 1497477: Experimental Crystal Structure Determination

2017

Related Article: Amélie Wannebroucq, Rita Meunier-Prest, Jean-Claude Chambron, Claire-Hélène Brachais, Jean-Moïse Suisse, Marcel Bouvet|2017|RSC Advances|7|41272|doi:10.1039/C7RA05325H

Space GroupCrystallographyCrystal SystemCrystal StructureCell Parameters346-trifluoro-5-(2-(2-thienyl)ethoxy)phthalonitrileExperimental 3D Coordinates
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