0000000001306837
AUTHOR
Sandeepta Saha
showing 11 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 …
A trigonal prismatic anionic iron(iii) complex of a radical o-iminobenzosemiquinonate derivative: structural and spectral analyses
2017
A new iron(III) complex, [Et3NH][FeIII(L2−˙)2] (1) with a substituted o-aminophenol based ligand is reported. Complex 1 is an anionic complex with a triethylammonium cation in the lattice. It contains two O,O,N-coordinated o-iminobenzosemiquinonate(2−) radical anions with an Fe(III) centre in a high-spin configuration. The crystal structure of 1 was determined by X-ray diffraction, which revealed a trigonal prismatic coordination environment whose electronic structure was established by various physical methods including EPR, Mossbauer spectroscopy and variable-temperature (2–300 K) magnetic susceptibility measurements. Electrochemical analysis indicated primarily ligand-centred redox proce…
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.
Magneto-structural and theoretical study of the weak interactions in a Mn(II) complex with a very unusual N,O-chelating coordination mode of 2-aminot…
2017
International audience; The Mn(II) complex {[Mn(atpa)(H2O)2]·H2O}n (1),with the dicarboxylate ligand 2-aminoterephthalic acid (H2atpa), has been synthesized and crystallographically, spectroscopically and magnetically characterized. Complex 1 shows a very unusual 1κ2N,O coordination mode of the aminoterephthalate dianion with the Mn(II) ion. One of the carboxylate groups shows a syn-anti-μ2-η1:η1 binding mode to form a 2D square grid. The magnetic properties of this compound can be very well reproduced with a regular S = 5/2 chain model with a very weak antiferromagnetic coupling constant of J = −0.2 cm−1 through the single syn-anti carboxylate bridges. EPR measurement also supports the exp…
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 …
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
CCDC 1051564: Experimental Crystal Structure Determination
2015
Related Article: Sandeepta Saha, Chirantan Roy Choudhury, Carlos J. Gómez-García, Eugenio Garribba, Antonio Bauzá, Antonio Frontera, Guillaume Pilet, Samiran Mitra|2017|Inorg.Chim.Acta|461|183|doi:10.1016/j.ica.2017.02.016
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
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
CCDC 1055476: Experimental Crystal Structure Determination
2017
Related Article: Sandeepta Saha, Chirantan Roy Choudhury, Carlos J. Gómez-García, Samia Benmansour, Eugenio Garribba, Antonio Frontera, Corrado Rizzoli, Samiran Mitra|2017|New J.Chem.|41|7283|doi:10.1039/C7NJ01212H
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