REACTION OF CuX2(X = Cl, Br) WITH 5,5-DIMETHYLMIDAZOLIDINE-2,4-DITHIONE (ss), AND THEIR -2-ONE-4-THIONE (oxs) AND -2-THIONE-4-ONE (sox) ISOLOGUES-CRYSTAL STRUCTURES OF CU(oxs)2Br AND Cu(ss)2Cl

Abstract
Copper(I) complexes, obtained by reacting CuX2 (X = Cl, Br) with 5.5-dimethylimidazolidine-2-thione-4-one (sox), and its 2-one-4-thione (oxs) and 2,4-dithione (ss) derivatives, are reported. Infrared spectra show evidence for S-coordination in all the complexes. The crystal structure of Cu(oxs)2Br shows dimeric units, where every copper(I), practically trigonal planar, undergoes a tetrahedral distorsion by long range interactions with one bridging bromine and one bridging sulphur atom of oxs. The crystal structure of Cu(ss)2Cl is formed by a polymeric chain in which every copper has a tetrahedral environment, achieved by two ligands bridged via the two sulphur atoms between two coppers, one ligand bonded only through the 2-thione sulphur, and one chlorine. The distortions of the C=O and C=S groups from the symmetrical positions with respect to the other two bonds of the C(sp2) carbons, verified in the complexes and in the free ligands, are interpreted in terms of the VSEPR model.

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