Search results for "RAM"

showing 10 items of 35643 documents

Can copper(II) mediate Hoogsteen base-pairing in a left-handed DNA duplex? A pulse EPR study

2010

Pulse EPR spectroscopy is sued to investigate possible structural features of the copper(II) ion coordinated to poly(dG-dC) poly(dG-dC) in a frozen aqueous solution, and the structural change of the polynucleotide induced by the presence of the metal ion. Two different copper species were identified and their geometry explained by a molecular model. According to this model, one species is exclusively coordinated to a single guanine with the N7 nitrogen atom forming a coordinative bond with the copper. In the other species, a guanine and a cytosine form a ternary complex together with the copper ion. A copper crosslink between the N7 of guanine and N3 of cytosine is proposed as the most prob…

10120 Department of ChemistryCircular dichroismGuanineStereochemistryHoogsteen base pairrame strutture del DNA basi nucleotidiche EPR a impulsi risonanza paramagneticachemistry.chemical_elementTriple-stranded DNA3107 Atomic and Molecular Physics and OpticsNucleobasechemistry.chemical_compoundPolydeoxyribonucleotidesDNA structures540 ChemistryDNA Z-FormPhysical and Theoretical ChemistryBase PairingTernary complexCircular Dichroismstructure elucidationElectron Spin Resonance Spectroscopypulse EPIR spectroscopynucleobasesCopperSettore FIS/07 - Fisica Applicata(Beni Culturali Ambientali Biol.e Medicin)Atomic and Molecular Physics and Opticschemistrycopper1606 Physical and Theoretical ChemistryCytosine
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Structural analysis of Cu(II) ligation to the 5'-GMP nucleotide by pulse EPR spectroscopy.

2007

JBIC Journal of Biological Inorganic Chemistry, 12 (6)

10120 Department of ChemistryConformational change1303 BiochemistryAnalytical chemistryGuanosine MonophosphateLigandsBiochemistrylaw.inventionInorganic Chemistrycopper; electron-nuclear double resonance; hyperfine sublevel correlation spectroscopy; pulse electron paramagnetic resonance spectroscopy; nucleotidelaw540 ChemistryOrganometallic CompoundsDNA Z-FormElectron paramagnetic resonanceHyperfine structurehyperfine sublevel correlation spectroscopyElectron nuclear double resonanceMolecular StructurePulsed EPRChemistryLigand1604 Inorganic ChemistryElectron Spin Resonance SpectroscopyDNAnucleotideSettore FIS/07 - Fisica Applicata(Beni Culturali Ambientali Biol.e Medicin)CrystallographyUnpaired electronpulse electron paramagnetic resonance spectroscopyNucleic Acid Conformationelectron-nuclear double resonanceTwo-dimensional nuclear magnetic resonance spectroscopyCopperJournal of biological inorganic chemistry : JBIC : a publication of the Society of Biological Inorganic Chemistry
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Crystal and solution structures of di-n-butyltin(IV) complexes of 5-[(E)-2-(4-methoxyphenyl)-1-diazenyl]quinolin-8-ol and benzoic acid derivatives: E…

2009

Abstract Reactions of nBu2SnCl(L1) (1), where L1 = acid residue of 5-[(E)-2-(4-methoxyphenyl)-1-diazenyl]quinolin-8-ol, with various substituted benzoic acids in refluxing toluene, in the presence of triethylamine, yielded dimeric mixed ligand di-n-butyltin(IV) complexes of composition [nBu2Sn(L1)(L2–6)]2 where L2 = benzene carboxylate (2), L3 = 2-[(E)-2-(2-hydroxy-5-methylphenyl)-1-diazenyl]benzoate (3), L4 = 5-[(E)-2-(4-methylphenyl)-1-diazenyl]-2-hydroxybenzoate (4), L5 = 2-{(E)-4-hydroxy-3-[(E)-4-chlorophenyliminomethyl]-phenyldiazenyl}benzoate (5) and L6 = 2-[(E)-(3-formyl-4-hydroxyphenyl)-diazenyl]benzoate (6). All complexes (1–6) have been characterized by elemental analyses, IR, 1H,…

10120 Department of Chemistry[(E)81303 Biochemistry5DenticityStereochemistry12Crystal structuredinBiochemistrybutyltin(IV) complexes(4Inorganic Chemistrychemistry.chemical_compoundPentagonal bipyramidal molecular geometry540 ChemistryMaterials ChemistryCarboxylatePhysical and Theoretical Chemistry2505 Materials ChemistryCoordination geometryXmixed ligandsol1604 Inorganic ChemistryChemistryCrystal structurebenzoic acidOrganic Chemistry5-[(E)-2-(4-methoxyphenyl)-1- diazenyl]quinolin-8-ol Di-n-butyltin(IV) complexes Benzoic acid Mixed ligands Solution and solid-state tin NMR Crystal structureNuclear magnetic resonance spectroscopysolution and solid state tinNMRBond lengthTrigonal bipyramidal molecular geometryCrystallographydiazenyl]quinolinmethoxyphenyl)Settore CHIM/03 - Chimica Generale E Inorganica1606 Physical and Theoretical Chemistry1605 Organic Chemistry
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CCDC 853880: Experimental Crystal Structure Determination

2012

Related Article: L.Kaufmann, E.V.Dzyuba, F.Malberg, N.L.Low, M.Groschke, B.Brusilowskij, J.Huuskonen, K.Rissanen, B.Kirchner, C.A.Schalley|2012|Org.Biomol.Chem.|10|5954|doi:10.1039/c2ob25196e

11'29'-Di-t-butyl-5'17'23'35'38'40'43'45'-octamethyl-7'15'25'33'-tetraazadispiro[cyclohexane-12'-heptacyclo-[32.2.2.2^36^.2^1619^.2^2124^.1^913^.1^2731^]hexatetracontane-20'1''-cyclohexane]-1'(36')3'5'9'(44')10'12'16'18'21'23'27'(39')28'30'34'37'-40'42'45'-octadecaene-8'14'26'32'-tetrone NN'-(ethane-12-diyl)-bis(N-methylbenzamide) chloroform solvateSpace GroupCrystallographyCrystal SystemCrystal StructureCell ParametersExperimental 3D Coordinates
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E. Esposito, Tra filologia e grammatica. Ricerche di papirologia e lessicografia greca

2018

1135-9560 8276 Studia philologica valentina 514939 2018 20 6886197 E. EspositoTra filologia e grammatica. Ricerche di papirologia e lessicografia greca RedondoUNESCO::CIENCIAS DE LAS ARTES Y LAS LETRASJordi 247 250:CIENCIAS DE LAS ARTES Y LAS LETRAS [UNESCO]
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Superfluorinated ionic liquid crystals based on supramolecular, halogen-bonded anions

2016

Unconventional ionic liquid crystals in which the liquid crystallinity is enabled by halogen-bonded supramolecular anions [CnF2 n+1-I⋯I⋯I-CnF2 n+1]- are reported. The material system is unique in many ways, demonstrating for the first time 1) ionic, halogen-bonded liquid crystals, and 2) imidazolium-based ionic liquid crystals in which the occurrence of liquid crystallinity is not driven by the alkyl chains of the cation. Out of the ordinary: The high directionality of halogen bonds and the fluorophobic effect were exploited in the design and synthesis of a new family of unconventional superfluorinated ionic liquid crystals. The liquid crystallinity of the system is driven by halogen-bonded…

116 Chemical sciencesInorganic chemistry1600Supramolecular chemistryIonic bonding010402 general chemistry01 natural sciencesCatalysissupramolecular chemistryCrystallinitychemistry.chemical_compoundLiquid crystal1503ta116Alkylchemistry.chemical_classificationHalogen bondionic liquid crystal010405 organic chemistryChemistryCommunicationChemistry (all)Self-assemblyGeneral MedicineGeneral Chemistryself-assemblyFluorophobic effect; Halogen bonding; Ionic liquid crystals; Self-assembly; Supramolecular chemistry; Chemistry (all); CatalysisCommunicationsfluorophobic effect0104 chemical sciencesCrystallographyhalogen bondingIonic liquidIonic liquid crystalsSettore CHIM/07 - Fondamenti Chimici Delle TecnologieFluorophobic effectSelf-assemblyHalogen bondingionic liquid crystalsSupramolecular chemistry
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Synthesis, Stability and Relaxivity of TEEPO-Met: An Organic Radical as a Potential Tumour Targeting Contrast Agent for Magnetic Resonance Imaging

2018

Cancer is a widespread and life-threatening disease and its early-stage diagnosis is vital. One of the most effective, non-invasive tools in medical diagnostics is magnetic resonance imaging (MRI) with the aid of contrast agents. Contrast agents that are currently in clinical use contain metals, causing some restrictions in their use. Also, these contrast agents are mainly non-specific without any tissue targeting capabilities. Subsequently, the interest has notably increased in the research of organic, metal-free contrast agents. This study presents a new, stable organic radical, TEEPO-Met, where a radical moiety 2,2,6,6-tetraethylpiperidinoxide (TEEPO) is attached to an amino acid, methio…

116 Chemical sciencesPharmaceutical ScienceContrast Media01 natural sciencesAnalytical Chemistrylaw.inventionGLUCOSENuclear magnetic resonancePiperidineslawHeterocyclic CompoundsNeoplasmsDrug DiscoveryMoietymagneettitutkimusSpin labelElectron paramagnetic resonanceta116orgaaniset yhdisteetmedicine.diagnostic_testMolecular StructureChemistryPhantoms ImagingRelaxation (NMR)radicalsMagnetic Resonance Imaging3. Good healthChemistry (miscellaneous)Molecular MedicineMRIRadical010402 general chemistryvapaat radikaalitImaging phantomArticleCyclic N-OxidesvarjoainetutkimusnitroxidesmedicineAnimalsHumanscontrast agentstyppiyhdisteetPhysical and Theoretical Chemistrymethionine010405 organic chemistryOrganic ChemistryElectron Spin Resonance SpectroscopyMagnetic resonance imagingIN-VITRO3126 Surgery anesthesiology intensive care radiologynitroxides; radicals; methionine; contrast agents; MRI; NMR; EPRIn vitroNMRTRANSPORT0104 chemical sciencesREDUCTIONSPIN-LABEL1182 Biochemistry cell and molecular biologyEPRMolecules; Volume 23; Issue 5; Pages: 1034
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Short X···N Halogen Bonds With Hexamethylenetetraamine as the Acceptor

2021

Hexamethylenetetramine (HMTA) and N-haloimides form two types of short (imide)X···N and X–X···N (X = Br, I) halogen bonds. Nucleophilic substitution or ligand-exchange reaction on the peripheral X of X–X···N with the chloride of N-chlorosuccinimide lead to Cl–X···N halogen-bonded complexes. The 1:1 complexation of HMTA and ICl manifests the shortest I···N halogen bond [2.272(5) Å] yet reported for an HMTA acceptor. Two halogen-bonded organic frameworks are prepared using 1:4 molar ratio of HMTA and N-bromosuccinimide, each with a distinct channel shape, one possessing oval and the other square grid. The variations in channel shapes are due to tridentate and tetradentate (imide)Br···N coordi…

116 Chemical scienceschemistry.chemical_elementHMTAN-haloimidechemistry.chemical_compoundkemialliset sidoksethalogen bond. hexamethylenetetraamine. N-haloimide.Nucleophilic substitutionsupramolekulaarinen kemiaQD1-999orgaaniset yhdisteetOriginal ResearchInterhalogenHalogen bondBrominehalogeenitChemistryhexamethylenetetraaminehalogen bond. hexamethylenetetraamine. N-haloimideGeneral ChemistryAcceptorChemistryCrystallographyCovalent bondinterhalogenHalogendihalogenhalogen bondHexamethylenetetramine
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CCDC 1456785: Experimental Crystal Structure Determination

2016

Related Article: Beáta Fekete, Márta Palkó, István Mándity, Matti Haukka, Ferenc Fülöp|2016|Eur.J.Org.Chem.|2016|3519|doi:10.1002/ejoc.201600434

12-hydroxy-312-diazapentacyclo[13.2.1.0214.0311.0510]octadeca-57916-tetraene-413-dione monohydrateSpace GroupCrystallographyCrystal SystemCrystal StructureCell ParametersExperimental 3D Coordinates
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CCDC 1431346: Experimental Crystal Structure Determination

2015

Related Article: Alexander Ganß, Raquel Belda, Javier Pitarch, Richard Goddard, Enrique García-España, and Stefan Kubik|2015|Org.Lett.|17|5850|doi:10.1021/acs.orglett.5b03027

14174043-Tetraoxa-14112027303746-octaazaheptacyclo[28.22.2.2427.269.22225.23235.24851]tetrahexaconta-6822243234485055576163-dodecaeneSpace GroupCrystallographyCrystal SystemCrystal StructureCell ParametersExperimental 3D Coordinates
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