New mixed-ligand cyanohydroxo octahedral cluster complex trans-[Re6S8(CN)2(OH)4]4−, its luminescence properties and chemical reactivity

A new rhenium cyanohydroxo octahedral cluster complex trans-[Re6S8(CN)2(OH)4]4− has been synthesized for the first time starting from K4[Re6S8(OH)6]·8H2O. It was crystallized as salts of compositions Cs2.67K1.33[Re6S8(CN)2(OH)4]·4H2O (1) and [Cu(NH3)4]2[Re6S8(CN)2(OH)4]·2H2O (2). By the reaction of trans-[Re6S8(CN)2(H2O)4], which was prepared by neutralization of 1 by diluted H2SO4, with molten 3,5-dimethylpyrazole (3,5-Me2PzH), the molecular complex trans-[Re6S8(3,5-Me2PzH)4(CN)2]·2H2O (3) was synthesized. Compounds 1–3 have been characterized by single-crystal X-ray diffraction and elemental analyses, IR spectroscopy and compounds 1 and 3 by UV-Vis and luminescence spectroscopy.