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Synthesis, spectral and electrochemical study of coordination molecules Cu4OX6L4: 3-cyanopyridine Cu4OBrnCl(6−n)(3-CNpy)4complexes

✍ Scribed by Gregor Ondrejovič; Adela Kotočová; Marian Koman; Peter Segľa

Book ID
111491351
Publisher
Versita
Year
2010
Tongue
English
Weight
433 KB
Volume
64
Category
Article
ISSN
0366-6352

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✦ Synopsis

Abstract

Seven new 3-cyanopyridine Cu4OBrnCl(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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