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Synthesis, spectral and electrochemical study of coordination molecules Cu4OX6L4: 3-cyanopyridine Cu4OBr n Cl(6−n)(3-CNpy)4 complexes

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Abstract

Seven new 3-cyanopyridine Cu4OBr n Cl(6−n)(3-CNpy)4 (n = 0–6) complexes were prepared and studied by infrared spectra, electronic spectra, and cyclic voltammetry. Infrared spectra revealed a distortion of the tetrahedral Cu4O core to C 2ν or C 3ν symmetries and a donor-acceptor vibrational coupling with the in-plane pyridine ring bending within the O-Cu-(pyridine ring)CN system involving the π-back bonding between Cu(II) atoms and 3-CNpy ligands. Bands of the electronic spectra and half-wave potentials of the complexes are consistent with the weak donor and strong acceptor behaviour of the 3-CNpy ligands. The results were compared with analogous complexes of pyridine, 3-substituted and 4-substituted pyridine ligands.

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Authors and Affiliations

  1. Institute of Inorganic Chemistry, Technology and Materials, Faculty of Chemical and Food Technology, Slovak University of Technology, SK-812 37, Bratislava, Slovak Republic

    Gregor Ondrejovič, Adela Kotočová, Marian Koman & Peter Segľa

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  1. Gregor Ondrejovič
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  2. Adela Kotočová
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  3. Marian Koman
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  4. Peter Segľa
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Correspondence to Gregor Ondrejovič.

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Ondrejovič, G., Kotočová, A., Koman, M. et al. Synthesis, spectral and electrochemical study of coordination molecules Cu4OX6L4: 3-cyanopyridine Cu4OBr n Cl(6−n)(3-CNpy)4 complexes. Chem. Pap. 64, 339–345 (2010). https://doi.org/10.2478/s11696-010-0016-8

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