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Unusual redox and chemical properties of N4-substituted pyridoxal thiosemicarbazone copper(II) complexes: their preparation, properties and reactivities

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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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Author notes

  1. Madan Mohan

    Present address: Department of Chemistry, Austin Community College, 1020 Grove Blvd, 78741, Austin, TX, USA

Authors and Affiliations

  1. Department of Chemistry, N.R.E.C. College, 203131, Khurja, India

    Madan Mohan, Niranjan S. Gupta & Munesh Kumar

  2. National Biomedical ESR Center, Medical College Wisconsin, 8701 Watertown Plank Road, 53226, Wauwatosa, WI, USA

    William E. Antholine

  3. Department of Chemistry, Southwest Texas State University, 78666, San Marcos, TX, USA

    Mohammed J. Ahmed

  4. Department of Chemistry, Indian Institute of Technology, 110016, Hauz Khas, New Delhi, India

    Narendra K. Jha

Authors
  1. Madan Mohan
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  2. Niranjan S. Gupta
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  3. Munesh Kumar
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  4. William E. Antholine
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  5. Mohammed J. Ahmed
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  6. Narendra K. Jha
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Mohan, M., Gupta, N.S., Kumar, M. et al. Unusual redox and chemical properties of N4-substituted pyridoxal thiosemicarbazone copper(II) complexes: their preparation, properties and reactivities. Transition Met Chem 19, 265–269 (1994). https://doi.org/10.1007/BF00139089

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  • DOI: https://doi.org/10.1007/BF00139089

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