New electron-deficient alkene and alkyne derivatives of Ru5(μ5-C)(CO)15: The syntheses and crystal structure analyses of Ru5(μ5-C)(CO)13 [C2H2(CO2Me)2] and Ru5(μ5-C)(CO)15 [C2(CO2Me)2]

[[abstract]]Treatment of carbido cluster Ru5(μ 5-C)(CO)15 with Me3NO in acetonitrile solution followed by addition of dimethyl maleate or dimethyl acetylene dicarboxylate affords new clusters Ru5(μ 5-C)(CO)13[C2H2(CO2Me)2] (1) and Ru5(μ 5-C)(CO)15[C2(CO2Me)2] (2), respectively. Single crystal X-ray structural studies reveal that both complexes contain a wingtip-bridged butterfly pentametallic skeleton. In complex1 the maleate fragment is coordinated to one wingtip Ru atom through its carbon-carbon double bond and to the adjacent Ru atom by the formation of two O → Ru dative bonding interactions, while the acetylene dicarboxylate fragment in2 is best considered as acis-dimetallated alkene, linking one hinge Ru atom and the nearby Ru atom at the bridged position. Crystal data for1: space group P 42/n;a=20.199(6),c=13.941(3) Å,Z=8; finalR F=0.025,R w=0.026 for 3963 reflections withI>2σ(I). Crystal data for2: space group P21/n;a=9.634(3),b=20.062(6),c=17.372(5) Å,β=90.62(2)°,Z=4; finalR F=0 033,R w=0.036 for 4683 reflections withI>3σ(I).[[fileno]]2010302010180[[department]]化學