Abstract
The interaction between homocysteine (HCysSH) and Cu(II) leads to the formation of a yellow complex [Cu I(HCysS-SCysH) 2]Cl (1) after redox processes in the Cu(II)–homocysteine system resulting in dimerization of the ligand and formation of a mononuclear Cu(I) complex with two dimers. The structure of (1) was obtained by IR-LD spectral analysis of a solid amorphous sample oriented in nematic liquid crystal medium. The original technique for orientation developed here and the polarized IR spectra thus obtained, permit the determination of the complexation sites and coordination mode of diamagnetic complexes. In the complex (1), Cu(I) is coordinated through the two O atoms of one COO − group of each of the ligands and the metal ion coordination sphere represents a distorted tetrahedron.
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