SUBSTITUTED CYCLOPENTADIENYLRUTHENIUM COMPLEXES CONTAINING (S,S) DONOR LIGANDS

Article abstract of DOI:10.1016/S0022-328X(00)99583-4

The complexes Ru(η-RC5H4)Cl(PPh3)2 (R = H, CH3, CH3CO) have been shown to react with the anionic S-S donor ligands M¹S2CX, (M¹ = Na, K, NH4⁺; X = OR', NR''2, CN) to give cyclopentadienyl dithiolate complexes of ruthenium(II).Analogous compounds have been obtained from thallium cyclopentadienide and Ru(S2CX)2(PPh3)2.Ru(η-CH3COC5H4)Cl(PPh3)2 (III) has been made by reaction between acetylcyclopentadiene, RuCl3(aq.), and PPh3 in absolute ethanol.Complexes of formula Ru(η-RC5H4)(S2CX)(PPh3)2, with the dithiolate ligand monodentate, are obtained when R = H, X = OC6H11; R = CH3, X = OCH3; R = H, CH3, X = CN.In the other cases studied the isolated complexes contain a bidentate S-S ligand.Steric effects as well as the electronic properties of dithiolate ligands, seem to influence the choice between the two coordination modes.Reaction of III with NaS2CNEt2 affords Ru(S2CNEt2)2(PPh3)2 as the sole product.Carbonylation of complex VI, Ru(η-C5H5)(S2COC6H11)(PPh3)2 takes place in solution, but the carbonyl complex could not be isolated.