Synthesis, spectral and electrochemical study of coordination molecules Cu4OX6L4: 3-cyanopyridine Cu4OBrnCl(6?n)(3-CNpy)4 complexes |
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Authors: | Gregor Ondrejovi? Adela Koto?ová Marian Koman and Peter Seg?a |
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Institution: | (1) Department of Chemistry, Jadavpur University, Kolkata, 700 032, West Bengal, India;(2) Department of Chemistry, Monash University, 3800 Victoria, Australia; |
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Abstract: | New 4-cyanopyridine halide and mixed-halide Cu4OBr
n
Cl(6−n)(4-CNpy)4 complexes (4-CNpy = 4-cyanopyridine, n = 0–6) were synthesised, characterised, and studied by infrared spectra, electronic spectra, and cyclic voltammetry. Infrared
spectra revealed donor-acceptor vibrational couplings of the Cu4O, Cu-Cl, and Cu-N stretching vibrations with the in-plane and out-of-plane pyridine ring vibrations. The infrared spectra,
electronic spectra, and half-wave potentials correspond to a weak donor and a strong acceptor behaviour of the 4-cyanopyridine
ligands and to π-back bonding, Cu(II)→pyridine rings. The results were compared with the related pyridine and 4-substituted pyridine complexes. |
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