Sulfur-Bridged Cubane-Type Molybdenum-Cadmium Clusters with Diethyldithiophosphato or Nitrilotriacetato Ligands

The metal incorporation reactions of the sulfur-bridged incomplete cubane-type molybdenum clusters in nonaqueous solvent or pure water are reported for the first time. The reaction of the clusters [Mo3S4(dtp)4(CH3CN)] (1) in acetonitrile and [Mo3S4(Hnta)3]2− in pure water with cadmium metal result in the formation of two novel molybdenum-cadmium mixed-metal clusters [(CH3CN)(dtp)4Mo3S4CdS4Mo3(dtp)4(CH3CN)] (3) and [(Hnta)3Mo3S4CdS4Mo3(Hnta)3]4− (4), respectively. Although the clusters 3 and 4 have sandwich cubane-type Mo3S4CdS4Mo38+ cores of the same type, the peak positions of electronic spectra of 3 (856 nm) and 4 (1235 nm) at the longest wavelength are distinctly different from each other.