title: X-ray diffraction study of copper(I) thiourea complexes formed in sulfate-containing acid solutions
abstract: The formation of three different copper(I) thiourea complexes in sulfate-containing 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)](SO(4)).H(2)O, was determined, and the formation and structures of [Cu(2)(tu)(5)](SO(4)).3H(2)O and [Cu(4)(tu)(7)](SO(4))(2).H(2)O were confirmed. The compound [Cu(2)(tu)(6)](SO(4)).H(2)O crystallizes in the P1; space group, with a = 11.079 (2), b = 11.262 (1), c = 12.195 (2) A, alpha = 64.84 (1), beta = 76.12 (1), gamma = 66.06 (1) degrees, and Z = 2. The Cu-thiourea 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 tetrahedral coordination with thiourea ligands and located at alternate sites on an eight-membered, crown-like ring.
authors: Universidad Nacional de La Plata and Instituto IFLP (CONICET), Departamento de Fisica, Facultad de Ciencias Exactas, Casilla de Correo 67, 1900 La Plata, Argentina.
authors: OE
authors: Piro
authors: RC
authors: Piatti
authors: AE
authors: Bolzan
authors: RC
authors: Salvarezza
authors: AJ
authors: Arvia