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

Abstract

A series of tetranuclear heterothiometallic clusters [Et 4N] 2[(MS 4) 2Au 2(dppe)] ( 1: M = Mo; 2: M = W), [PPh 4] 2[(MoOS 3) 2Au 2(dppe)] ( 3), [Et 4N] 2[(WOS 3) 2Au 2(dppe)] ( 4) (dppe = 1,2-bis(diphenylphosphino)ethane), [Et 4N] 2[(MS 4) 2Au 2(dppf)] ( 5: M = Mo; 6: M = W) and [Et 4N] 2[(MOS 3) 2Au 2(dppf)] ( 7: M = Mo; 8: M = W) (dppf = 1,1′-bis(diphenylphosphino)ferrocene) have been synthesized from the reactions of thiometalates [MXS 3] 2− (M = Mo or W, X = O or S), AuCl(SC 4H 8) and dppe or dppf. The crystal structures of the complexes 2, 4 and 6 have been determined by single-crystal X-ray diffraction studies. In the molecular structures of these complexes, the two linear M/Au/S units are linked via bidentate phosphines dppe or dppf. The complexes have been fully characterized by IR, UV–vis as well as elemental analyses. These clusters all exhibit room-temperature luminescence in the solid state.