Activation of carbon disulfide on triruthenium clusters:: Synthesis and X-ray crystal structure analysis of [RU3(CO)5(μ-H)2(μ-PCy2)(μ-Ph2PCH2PPh2){μ-η2-PCy2C(S)}(μ3-S)] and [Ru3(CO)5(CS)(μ-H)(μ-PtBu2)(μ-PCy2)2(μ3-S)]

[Ru-3(CO)(6)(mu -H)(2)(mu -PCy2)(2)(mu -dppm)] (1) (dppm = Ph2PCH2PPh2) reacts under mild conditions with CS2 and yields by oxidative decarbonylation and insertion of CS into one phosphido bridge the opened 50 VE-cluster [Ru-3(CO)(5)(mu -H)(2)(U mu -PCy2)(mu -dppm){mu-eta (2)-PCy2C(S))(mu (3)-S)] (2) with only two M-M bonds. The compound 2 crystallizes in the triclinic space group P (1) over bar with a = 19.093(3), b = 12.2883(12), c=20.098(3) Angstrom; alpha =84.65(3), beta =77.21(3), gamma = 81.87(3)degrees and V = 2790.7(11) Angstrom (3). The reaction of [Ru-3(CO)(7)(mu -H)(mu -(PBu2)-Bu-t)(mu -PCy2)(2)] (3) with CS2 in refluxing toluene affords the 50 VE-cluster [Ru-3(CO)(5)(CS)-(mu -H)(mu -(PBu2)-Bu-t)(mu -PCy2)(2)(mu (5)-S)] (4). The compound cristallizes in the monoclinic space group P2(1)/a with a = 19.093(3), b = 12.2883(12), c=20.098(3) Angstrom; beta = 104.223(16)degrees and V = 4570.9(10) Angstrom (3). Although in the solid state structure one elongated Ru-Ru bond has been found the complex 4 can be considered by means of the P-31-NMR data as an electronrich metal cluster.