EXAFS study of copper complexes with azomethinic ligand environment |
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Authors: | V G Vlasenko A I Uraev Ya V Zubavichus A A Chernyshov A D Garnovskii R K Mamin |
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Institution: | (1) Institute of Physics, Southern State University, pr. Stachki, 194, Rostov-on-Don, 344090, Russia;(2) Institute of Physical and Organic Chemistry, Southern State University, pr. Stachki, 194/2, Rostov-on-Don, 344090, Russia;(3) Russian Research Centre Kurchatov Institute, pl. Akademika Kurchatova 1, Moscow, 123182, Russia |
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Abstract: | A series of copper metallochelates C22H18CuN4O2 X (X = Se, S, O) as models of active centers of natural metalloproteins have been synthesized on the basis of new azomethine ligand systems. The structure of the complexes has been studied by extended X-ray absorption fine-structure spectroscopy. It is shown that, in the metallochelates with X = Se or S, one azomethine chalcogen-containing ligand undergoes tridentate interaction with copper ions, while the other ligand is an acetate group. As a result, a complex with the N2O2 X environment is formed, where one of the oxygen atoms of the acetate group is at a large distance from the metal ion: R = 2.56–2.68 Å. For the metallochelate with X = O, coordination of the acetate group by a copper ion is found to be absent, and only interaction with azomethine ligands having average Cu-N/O distances R = 1.96–2.04 Å is observed. |
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