Two novel copper coordination compounds with thiosulfate anions as ligands - Solid state and reaction medium thermal decomposition

Thermal investigations of two novel coordination compounds, potential precursor of copper sulfides, namely [Cu-2(S2O3)(2)(NH3)(4)].5H(2)O and Na-2[Cu-4(S2O3)(5)(NH3)(8)].2H(2)O were performed either in solid state (static air atmosphere), as well as in reaction medium. During both decompositions, Cu2+ reduction occurs. In solid state decomposition, a mixture containing sulfides and sulfates is observed. In the reaction medium, CuSy compounds with sulfur content y (0.66<y<1) dependent on thiosulfate concentration are obtained.