Synthesis, structures, and electrochemistry of diiron toluene-3,4-dithiolate complexes containing phosphine ligands

In this paper, four diiron toluene-3,4-dithiolate complexes with phosphine ligands were synthesized and characterized. Treatment of complex [Fe-2(CO)(6){mu-SC6H3(CH3)S}] (1) with the corresponding phosphine ligands ethyl diphenylphosphinite, 4-(dimethylamino)phenyldiphenylphosphine, 2-(diphenylphosphino)biphenyl, or vinyldiphenylphosphine in the presence of Me3NO center dot 2H(2)O as the CO-oxidative agent afforded the products [Fe-2(CO)(5)(L){mu-SC6H3(CH3)S}] (L = Ph2POCH2CH3, 2; Ph2P(4-C6H4NMe2), 3; Ph2P(2-C6H4Ph), 4; Ph2PCH = CH2, 5) in 68-88% yields. The complexes 2-5 were characterized by elemental analysis, IR, NMR spectroscopy, as well as by X-ray diffraction analysis. Furthermore, the electrochemistry of these complexes was studied by cyclic voltammetry.