Tetrahedral Rhenium Cluster Complexes with Mixed-Ligand Cores {Re4As3Q}5+ (Q = S, Se) and {Re4As2S2}6+

A high-temperature reactions of equimolar amounts of ReI3, As and S or Se with KCN following by recrystallization of the soluble products from water led to the formation of new cyanometallate cluster complexes K7[{Re4As3S}(CN)12]·10H2O (1) and K7[{Re4As3Se}(CN)12]·9.5H2O (2), respectively. Involvement of As2S3 instead of the mixture of As and S resulted in the formation of a cluster complex K6[{Re4As2S2}(CN)12]·3.5H2O (3). Crystal structures of the obtained compounds were investigated by the X-ray diffraction analysis. It was found that compounds 1–3 contain a new cubane cluster cores composed of the rhenium tetrahedron surrounded by the µ3-As and µ3-Q (Q = S, Se) ligands.