Unusual redox and chemical properties of N4-substituted pyridoxal thiosemicarbazone copper(II) complexes: their preparation,properties and reactivities |
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| Authors: | Madan Mohan Niranjan S Gupta Munesh Kumar William E Antholine Mohammed J Ahmed Narendra K Jha |
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| Institution: | (1) Department of Chemistry, N.R.E.C. College, 203131 Khurja, India;(2) Present address: Department of Chemistry, Austin Community College, 1020 Grove Blvd, 78741 Austin, TX, USA;(3) National Biomedical ESR Center, Medical College Wisconsin, 8701 Watertown Plank Road, 53226 Wauwatosa, WI, USA;(4) Department of Chemistry, Southwest Texas State University, 78666 San Marcos, TX, USA;(5) Department of Chemistry, Indian Institute of Technology, 110016 Hauz Khas, New Delhi, India |
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| Abstract: | Summary New copper(II) complexes with pyridoxal N4-methylthiosemicarbazone (H2Methsa), N4-ethylthiosemicarbazone (H2Etthsa) and N4-phenylthiosemicarbazone (H2Phthsa) have been prepared and characterized by analytical, magnetic, spectral, e.s.r. and electrochemical methods. All the compounds exhibit normal magnetic moments at room temperature. The variable temperature magnetic moments, however, show the presence of very weak intramolecular antiferromagnetic interaction (–2J = ca. 30cm-1) between the copper(II) centres in the complexes. The e.s.r. spectra at 77 K in DMSO indicate the presence of a mixture of monomers and dimers consistent with the dissociation of the complexes. Electrochemical studies in non-aqueous solvents show that the complexes undergo a quasi-reversible one electron facile reduction at markedly low negative potentials versus saturated calomel electrode (s.c.e.). |
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