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 K-7[{Re4As3S}(CN)(12)]center dot 10H(2)O (1) and K-7[{Re4As3Se}(CN)(12)]center dot 9.5H(2)O (2), respectively. Involvement of As2S3 instead of the mixture of As and S resulted in the formation of a cluster complex K-6[{Re4As2S2}(CN)(12)]center dot 3.5H(2)O (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 mu(3)-As and mu(3)-Q (Q = S, Se) ligands.