X-ray diffraction study of copper(I) thiourea complexes formed in sulfate-containing acid solutions

The formation of three different copper(I) thiourea complexes in sulfate-co ntaining acid solutions was observed. The ratio between Cu-I and thiourea ( tu) in these complexes depends on the amount of thiourea and copper sulfate in the solution. The crystal and molecular structure of a new complex, [Cu -2(tu)(6)](SO4).H2O, was determined, and the formation and structures of [C u-2(tu)(5)](SO4). 3H(2)O and [Cu-4(tu)(7)](SO4)(2).H2O were confirmed. The compound [Cu-2(tu)(6)](SO4).H2O crystallizes in the P (1) over bar space gr oup, with a = 11.079 (2), b = 11.262 (1), c = 12.195 (2) Angstrom, alpha = 64.84 (1), beta = 76.12 (1), gamma = 66.06 (1)degrees, and Z = 2. The Cu-th iourea complex is arranged as a Cu-I tetranuclear ion, [Cu-4(tu)(12)](4+), sited on a crystallographic inversion center. All copper ions are in a tetr ahedral coordination with thiourea ligands and located at alternate sites o n an eight-membered, crown-like ring.