Electrochemical synthesis and structural characterization of copper and silver complexes of imidazolidine-2-thione ligands

摘要

The electrochemical oxidation of anodic metal (copper and silver) in acetonitrile solutions of the appropriate 1-R-imidazolidine-2-thione (1-RImSH) afforded complexes of composition [M(1-RImS)], M = Cu, Ag, R = Me, Et, Pr, Tr. The compounds have been characterized by microanalysis, IR, NMR and mass spectroscopy and, in the case of [Cu(1-EtImS)] (1), [Cu(1-PrImS)] (2), [Ag1-PrImS)] (3) and [Ag(1-PrImS)] (4), by X-ray diffraction. Compounds (1) and (2) are tetranuclear with an array of four copper atoms at the vertices of a tetrahedron bridged by four sulfur atoms. Each copper atom has a distorted trigonal [CuS2N] environment with each ligand acting as a mu(2)-N,S(eta(2)-S; eta(1)-N) bidentate S-bridging ligand. Complexes 3 and 4 are hexanuclear with six silver atoms at the vertices of a distorted octahedron and the ligand acting as a mu(2)-N, S(eta(2)-S; eta(1)-N) bidentate S-bridging five-electron donor. In the crystals the copper molecules are interconnected by weak intermolecular C-H... S and C-H... it interactions but, in contrast, the silver molecules are linked by weak intermolecular C-H center dot center dot center dot N and C-H center dot center dot center dot pi interactions. (c) 2005 Elsevier Ltd. All rights reserved.