Abstract
The preparation is described of a novel type of formazan complex, the bis(1,5-diphenylformazan)copper(I) cation. The crystal structure of its perchlorate salt has been cleared by an X-ray study. Copper(I) forms 5-membered rings with each of two bidentate, non-ionized formazan molecules. The coordination polyhedron of copper is a distorted tetrahedron. The coordination in the oxidized product of the copper(I) complex in ethanol has been obtained from the ESR spectrum. The redox reactions of the copper(I) complex have reinforced an earlier interpretation of the mechanism of copper(II) oxidation of formazans via coordination of neutral formazan.
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