Journal
RUSSIAN CHEMICAL BULLETIN
Volume 49, Issue 11, Pages 1863-1868Publisher
SPRINGER
DOI: 10.1007/BF02494925
Keywords
azomethines; copper; pyrazolones; chelates; biomimetic models; blue copper proteins; X-ray diffraction analysis; UV, ESR, and EXAFS spectroscopy
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Copper(ii) chelates of composition CuL2 were synthesized based on 4-aminomethylene derivatives of 5-thiopyrazoles (LH). The complexes were studied by UV, IK, ESR, and EXAFS spectroscopy, magnetochemistry, and X-ray diffraction analysis. The coordination polyhedra in the complexes are pseudotetrahedra or octahedra of the types CuN2S2 or CuN4S2, respectively, which are distorted due to the Jahn-Teller effect. The UV and ESR spectra of copper chelates with a six-coordinate metallocycle formed by the N and S atoms of the azomethine ligand and the nitrogen atom of the quinoline substituent (R) of the C=N-R fragment are most similar to the spectra observed for metals involved in the active centers of natural metalloenzymes (blue copper proteins).
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