0000000001304273

AUTHOR

Ashok Sasmal

showing 15 related works from this author

Effect of temperature and ligand protonation on the electronic ground state in Cu( ii ) polymers having unusual secondary interactions: a magnetic an…

2018

International audience; Two new copper(II) polymeric complexes, {[Cu(HPymat)(H2O)](NO3)}n (1) and [Cu2(Pymat)2(H2O)3]n (2), have been synthesized using the Schiff base ligand H2Pymat [H2Pymat = (E)-2-(1-(pyridin-2-yl)-methyleneamino)terephthalic acid]. Complex 1 is a cationic 1D polymer, whereas complex 2 is a two dimensional polymer. Both complexes were crystallographically, spectroscopically and magnetically characterized. Theoretical studies were performed and the catecholase activity of the complexes was also examined. Complex 1 is a ferromagnetically coupled complex with J = 2.8 cm−1 and 2 shows antiferromagnetic coupling with J = −1.6 cm−1. Both complexes show notable features in the …

Models MolecularPolymerschemistry.chemical_elementProtonation010402 general chemistryCrystallography X-RayLigands01 natural scienceslaw.inventionInorganic Chemistrychemistry.chemical_compoundlawCoordination ComplexesMolecule[CHIM]Chemical SciencesElectron paramagnetic resonanceSchiff baseMolecular Structure010405 organic chemistryLigandMagnetic PhenomenaTemperatureTwo-dimensional polymer[CHIM.MATE]Chemical Sciences/Material chemistryHydrogen-Ion ConcentrationCopper0104 chemical sciencesCrystallography[CHIM.POLY]Chemical Sciences/PolymerschemistryQuantum TheoryProtonsGround stateCatechol OxidaseCopper
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Reversible switching of the electronic ground state in a pentacoordinated Cu(ii) complex.

2013

International audience; An easy reversible switching of the electronic ground state in a pentacoordinated copper(ii) complex is reported for the first time. The simple protonation of a carboxylic group in a Cu(ii) complex with a {dx(2)-y(2)}(1) electronic configuration leads to a flip of the ground electronic configuration from {dx(2)-y(2)}(1) to {dz(2)}(1) in the metal ion.

Carboxylic groupMolecular Conformationchemistry.chemical_elementInorganic compoundsElectronsProtonationCrystallography X-Ray010402 general chemistry01 natural sciencesCatalysisMetalCoordination ComplexesComputational chemistryElectronic ground stateMaterials Chemistry010405 organic chemistryChemistryMetals and AlloysGeneral Chemistry[CHIM.MATE]Chemical Sciences/Material chemistryCopper3. Good health0104 chemical sciencesSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsReversible switchingvisual_artCeramics and Compositesvisual_art.visual_art_mediumQuantum TheoryPhysical chemistryElectron configurationGround stateCopper
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Switching and redox isomerism in first-row transition metal complexes containing redox active Schiff base ligands.

2014

International audience; The reversible redox isomerisms in first row transition metal complexes of the type ML2 were studied. The six ML2 complexes (M = Mn(III) (), Fe(II) (), Co(III) (), Ni(II) (), Cu(II) () and Zn(II) ()) were synthesized with a redox active Schiff base ligand [2-(3,5-di-tert-butyl-2-hydroxyphenylamino)-4-chlorophenol] (H3L) presenting different oxidation states from -2 to 0 (L(2-), L(-) and L(0)). EPR spectra and magnetic susceptibility measurements indicate the presence of complexes of the type [Mn(III)(L(2-))(L(-))] () with S = 1/2, [Fe(II)(L(-))2] () with S = 2, [Co(III)(L(2-))(L(-))] () with S = 1/2, [Ni(II)(L(-))2] () with S = 1, [Cu(II)(L(-))2] () with S = 1/2 and …

010402 general chemistryLigands01 natural sciencesRedoxlaw.inventionInorganic Chemistrychemistry.chemical_compoundElectron transferTransition metalIsomerismlawCoordination ComplexesMetals HeavyElectron paramagnetic resonanceSchiff BasesValence (chemistry)Schiff base010405 organic chemistryLigand[CHIM.MATE]Chemical Sciences/Material chemistryTautomer0104 chemical sciences3. Good healthCrystallographychemistryOxidation-Reduction
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A new linear double phenoxide-bridged trinuclear Cu(II) Schiff base complex: Synthesis, crystallographic elucidation, magneto-structural correlation …

2014

Abstract The tetradentate (ONNO) donor Schiff base ligand LH2, derived from the condensation of salicylaldehyde and 1,3-diaminopropane, has been synthesized and reacted with CuBr2 to yield a trinuclear complex with the molecular formula [Cu3L2Br2]. Single crystal X-ray diffraction study reveals that the two terminal copper atoms adopt a square pyramidal geometry, whereas the central copper atom, situated at the inversion centre, is surrounded by four phenoxide oxygen atoms in a square planar fashion. Variable temperature magnetic susceptibility measurement study shows strong antiferromagnetic intra-trimer interactions between the copper centers with a J value of −302 cm−1. EPR study of the …

Schiff baseChemistrychemistry.chemical_elementMagnetic susceptibilityCopperSquare pyramidal molecular geometrylaw.inventionInorganic ChemistryCrystallographychemistry.chemical_compoundSalicylaldehydelawMaterials ChemistryAntiferromagnetismPhysical and Theoretical ChemistryElectron paramagnetic resonanceSingle crystalPolyhedron
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Copper-Assisted Hemiacetal Synthesis: A Cu II Chain Obtained by a One-Step in situ Reaction of Picolinaldehyde

2014

International audience; The 1D polymer complex [Cu2(L)2(SCN)2]n (1 ) has been synthesised in a one‐step in situ reaction of picolinaldehyde with sodium thiocyanate. The complex 1 was characterised by FTIR spectroscopy, UV/Vis spectrophotometry and elemental analysis. The crystal structure of complex 1 shows that chains of dimer complexes are formed with tetra‐ and pentacoordinate copper centres alternately linked by one thiocyanato and two alkoxido bridges. Variable‐temperature magnetic measurements showed a strong antiferromagnetic interaction between the copper centres within the dimer mediated by the two alkoxido bridges with a J value of –374 cm–1, which is in agreement with the DFT‐cal…

Cyclic voltammetryDimerInorganic chemistrychemistry.chemical_elementCrystal structure[CHIM.INOR]Chemical Sciences/Inorganic chemistrylaw.inventionInorganic Chemistrychemistry.chemical_compoundlawSpectrophotometryMagnetic propertiesmedicine[CHIM]Chemical SciencesElectron paramagnetic resonancePolynuclear complexesmedicine.diagnostic_testCopperIn situ ligand synthesisCrystallographyDensity functional calculationschemistryHemiacetalSodium thiocyanateCyclic voltammetryCopperEPR spectroscopy
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CCDC 921248: Experimental Crystal Structure Determination

2014

Related Article: Ashok Sasmal, Eugenio Garribba, Carlos J. Gómez-García, Cédric Desplanches, Samiran Mitra|2014|Dalton Trans.|43|15958|doi:10.1039/C4DT01699H

(2-(35-Di-t-butyl-2-oxophenylamino)-4-chlorophenolato radical dianion)-(2-(35-di-t-butyl-2-oxophenylamino)-4-chlorophenolato)-cobalt(iii)Space GroupCrystallographyCrystal SystemCrystal StructureCell ParametersExperimental 3D Coordinates
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CCDC 921246: Experimental Crystal Structure Determination

2014

Related Article: Ashok Sasmal, Eugenio Garribba, Carlos J. Gómez-García, Cédric Desplanches, Samiran Mitra|2014|Dalton Trans.|43|15958|doi:10.1039/C4DT01699H

Space GroupCrystallographyCrystal System(2-(35-Di-t-butyl-2-oxophenylamino)-4-chlorophenolato radical dianion)-(2-(35-di-t-butyl-2-oxophenylamino)-4-chlorophenolato)-manganese(iii) acetonitrile solvateCrystal StructureCell ParametersExperimental 3D Coordinates
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CCDC 881999: Experimental Crystal Structure Determination

2013

Related Article: Ashok Sasmal,Sandeepta Saha,Carlos J. Gomez-Garcia,Cedric Desplanches,Eugenio Garribba,Antonio Bauza,Antonio Frontera,Reum Scott,Ray J. Butcher,Samiran Mitra|2013|Chem.Commun.|49|7806|doi:10.1039/C3CC44276D

Space GroupCrystallographyCrystal SystemCrystal StructureCell Parametersbis(mu2-Chloro)-bis(2-((1-(pyridin-2-yl)ethylidene)amino)terephthalato)-di-copper(ii) monohydrateExperimental 3D Coordinates
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CCDC 933880: Experimental Crystal Structure Determination

2014

Related Article: Piu Dhal, Ashok Sasmal, Carlos J. Gómez-García, Antonio Bauzá, Antonio Frontera, Guillaume Pilet, Samiran Mitra|2014|Eur.J.Inorg.Chem.||3271|doi:10.1002/ejic.201402176

catena-(bis(mu~2~-2-(Methoxy(oxy)methyl)pyridine)-(mu~2~-thiocyanato-NS)-isothiocyanato-di-copper)Space GroupCrystallographyCrystal SystemCrystal StructureCell ParametersExperimental 3D Coordinates
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CCDC 882000: Experimental Crystal Structure Determination

2014

Related Article: Sandeepta Saha, Ashok Sasmal, Chirantan Roy Choudhury, Carlos J. Gomez-Garcia, Eugenio Garribba, Samiran Mitra|2014|Polyhedron|69|262|doi:10.1016/j.poly.2013.12.006

bis(mu2-22'-(Propane-13-diylbis(nitrilomethylylidene))diphenoxo)-dibromo-tri-copper(ii)Space GroupCrystallographyCrystal SystemCrystal StructureCell ParametersExperimental 3D Coordinates
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CCDC 1560984: Experimental Crystal Structure Determination

2018

Related Article: Sandeepta Saha, Niladri Biswas, Ashok Sasmal, Carlos J. Gómez-García, Eugenio Garribba, Antonio Bauza, Antonio Frontera, Guillaume Pilet, Georgina M. Rosair, Samiran Mitra, Chirantan Roy Choudhury|2018|Dalton Trans.|47|16102|doi:10.1039/C8DT02417K

Space GroupCrystallographyCrystal Systemcatena-((mu-2-{[(pyridin-2-yl)methylidene]amino}benzene-14-dicarboxylato)-aqua-copper nitrate hemihydrate)Crystal StructureCell ParametersExperimental 3D Coordinates
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CCDC 984617: Experimental Crystal Structure Determination

2014

Related Article: Ashok Sasmal, Eugenio Garribba, Carlos J. Gómez-García, Cédric Desplanches, Samiran Mitra|2014|Dalton Trans.|43|15958|doi:10.1039/C4DT01699H

(2-(35-Di-t-butyl-2-oxophenylamino)-4-chlorophenolato radical dianion)-(2-(35-di-t-butyl-2-oxophenylamino)-4-chlorophenolato)-cobalt(iii)Space GroupCrystallographyCrystal SystemCrystal StructureCell ParametersExperimental 3D Coordinates
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CCDC 921249: Experimental Crystal Structure Determination

2014

Related Article: Ashok Sasmal, Eugenio Garribba, Carlos J. Gómez-García, Cédric Desplanches, Samiran Mitra|2014|Dalton Trans.|43|15958|doi:10.1039/C4DT01699H

Space GroupCrystallographyCrystal SystemCrystal Structurebis(2-(35-Di-t-butyl-2-oxophenylamino)-4-chlorophenolato)-nickel(ii) methanol solvateCell ParametersExperimental 3D Coordinates
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CCDC 1560985: Experimental Crystal Structure Determination

2018

Related Article: Sandeepta Saha, Niladri Biswas, Ashok Sasmal, Carlos J. Gómez-García, Eugenio Garribba, Antonio Bauza, Antonio Frontera, Guillaume Pilet, Georgina M. Rosair, Samiran Mitra, Chirantan Roy Choudhury|2018|Dalton Trans.|47|16102|doi:10.1039/C8DT02417K

catena-(bis(mu-2-{[(pyridin-2-yl)methylidene]amino}terephthalato)-di-copper tetrahydrate)Space GroupCrystallographyCrystal SystemCrystal StructureCell ParametersExperimental 3D Coordinates
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CCDC 921247: Experimental Crystal Structure Determination

2014

Related Article: Ashok Sasmal, Eugenio Garribba, Carlos J. Gómez-García, Cédric Desplanches, Samiran Mitra|2014|Dalton Trans.|43|15958|doi:10.1039/C4DT01699H

Space GroupCrystallographyCrystal SystemCrystal StructureCell Parametersbis(2-(35-Di-t-butyl-2-oxophenylamino)-4-chlorophenolato)-iron(ii)Experimental 3D Coordinates
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