Triruthenium clusters bearing bridging dppm and capping sulfido ligands: X-ray structures of [Ru3(CO)6(μ3-CO)(μ3-S)(PPh3)(μ-dppm)] and [Ru3(CO)6(μ3-S)2(PPh3)(μ-dppm)]

Treatment of [Ru3(CO)10(μ-dppm)] (1) with PPh3S at ambient temperature gave [Ru3(CO)7(μ3-CO)(μ3-S)(μ-dppm)] (2) and [Ru3(CO)6(μ3-CO)(μ3-S)(PPh3)(μ-dppm)] (3). The reaction of [Ru3(CO)7(μ3-S)2(μ-dppm)] (4) with PPh3 in the presence of Me3NO afforded 3, [Ru3(CO)6(μ3-S)2(PPh3)(μ-dppm)] (5) and [(μ-H)2Ru3(CO)7(μ3-S)(μ-dppm)] (6). A similar reaction of [Ru3(CO)7(μ3-S)(μ3-Se)(μ-dppm)] (7) with PPh3 afforded [Ru3(CO)6(μ3-S)(μ3-Se)(PPh3)(μ-dppm)] (8). Protonation of 4 and 7 with CF3COOH gave [(μ-H)Ru3(CO)7(μ3-S)2(μ-dppm)]+ (10) and [(μ-H)Ru3(CO)7(μ3-Se)(μ3-S)(μ-dppm)]+ (11), respectively, isolated as their PF6 salts.