CLUSTER CHEMISTRY. XXXXII. SOME RUTHENIUM CARBONYL COMPLEXES OF cis-1,2-BIS(DIPHENYLPHOSPHINO)ETHENE. X-RAY STRUCTURE OF Ru2(CO)6

Article abstract of DOI:10.1016/S0022-328X(00)98939-3

A reaction between Ru3(CO)12 and cis-PPh2CH=CHPPh2 (ebdp), catalysed by , gave Ru3(μ-ebdp)(CO)10, which readily eliminated Ru(CO)4 on heating to form Ru2(μ-ebdp)(CO)6 in high yield.This complex has been fully characterised by an X-ray study, the ligand chelates one, nearly square-planar ruthenium, with the two phosphorus donors and bonds to the second, nearly trigonal bipyramidal ruthenium, via the C=C double bond.The Ru-Ru bond (2.8812(6) Angstroem) is formally a 2e donor bond from the square planar Ru to the trigonal bipyramidal Ru.The complex Ru2<μ-C2H2(PPh2)2>(CO)6 is monoclinic, space group P2₁/c with a 12.242(3), b 18.821(3), c 13.613(2) Angstroem, β 90.69(1) deg and Z = 4; 5036 independent data with I > 3?(I) were refined to R 0.034, R' 0.036.The reaction between Os3(CO)12 and ebdp gave only Os3(μ-ebdp)(CO)10.