Syntheses, crystal structures and characterization of a series of heterothiometallic gold(I) complexes containing bridging diphosphine ligands

A series of tetranuclear heterothiometallic clusters [Et4N]2[(MS4)2Au2(dppe)] (1: M = Mo; 2: M = W), [PPh4]2[(MoOS3)2Au2(dppe)] (3), [Et4N]2[(WOS3)2Au2(dppe)] (4), [Et4N]2[(MS4)2Au2(dppf)] (5: M = Mo; 6: M = W) and [Et4N]2[(MOS3)2Au2(dppf)] (7: M = Mo; 8: M = W) have been synthesized. In the molecular structures of 2, 4 and 6, the two linear M/Au/S units are linked via bidentate phosphines, dppe or dppf. These clusters all exhibit room-temperature luminescence in the solid state.