0000000001304273
AUTHOR
Ashok Sasmal
Effect of temperature and ligand protonation on the electronic ground state in Cu( ii ) polymers having unusual secondary interactions: a magnetic and catechol oxidase study
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 …
Reversible switching of the electronic ground state in a pentacoordinated Cu(ii) complex.
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.
Switching and redox isomerism in first-row transition metal complexes containing redox active Schiff base ligands.
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 …
A new linear double phenoxide-bridged trinuclear Cu(II) Schiff base complex: Synthesis, crystallographic elucidation, magneto-structural correlation and DFT Study
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 …
Copper-Assisted Hemiacetal Synthesis: A Cu II Chain Obtained by a One-Step in situ Reaction of Picolinaldehyde
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…
CCDC 921248: Experimental Crystal Structure Determination
Related Article: Ashok Sasmal, Eugenio Garribba, Carlos J. Gómez-García, Cédric Desplanches, Samiran Mitra|2014|Dalton Trans.|43|15958|doi:10.1039/C4DT01699H
CCDC 921246: Experimental Crystal Structure Determination
Related Article: Ashok Sasmal, Eugenio Garribba, Carlos J. Gómez-García, Cédric Desplanches, Samiran Mitra|2014|Dalton Trans.|43|15958|doi:10.1039/C4DT01699H
CCDC 881999: Experimental Crystal Structure Determination
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
CCDC 933880: Experimental Crystal Structure Determination
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
CCDC 882000: Experimental Crystal Structure Determination
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
CCDC 1560984: Experimental Crystal Structure Determination
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
CCDC 984617: Experimental Crystal Structure Determination
Related Article: Ashok Sasmal, Eugenio Garribba, Carlos J. Gómez-García, Cédric Desplanches, Samiran Mitra|2014|Dalton Trans.|43|15958|doi:10.1039/C4DT01699H
CCDC 921249: Experimental Crystal Structure Determination
Related Article: Ashok Sasmal, Eugenio Garribba, Carlos J. Gómez-García, Cédric Desplanches, Samiran Mitra|2014|Dalton Trans.|43|15958|doi:10.1039/C4DT01699H
CCDC 1560985: Experimental Crystal Structure Determination
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
CCDC 921247: Experimental Crystal Structure Determination
Related Article: Ashok Sasmal, Eugenio Garribba, Carlos J. Gómez-García, Cédric Desplanches, Samiran Mitra|2014|Dalton Trans.|43|15958|doi:10.1039/C4DT01699H