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Synthesis, Characterization and Thermal Behavior of Complexes of Cu(II), Zn(II) and Cd(II) with S,S′-Methylenebis(Cysteine)

Synthesis and characterization, including data on thermal decomposition, are reported for the complexes of S,S'-methylenebis(cysteine) (djenkolic acid) with copper(II), zinc(II) and cadmium(II): CuC7H12N2O4S2 [I]; ZnC7H12N2O4S2 [II] and CdC7H12N2O4S2 [III]. X-ray diffraction showed that the compounds are isostructural and belong to a monoclinic system. According to IR spectra, COO, NH2 groups and bridging sulfur atoms are the main coordination sites.