Crystal structure of the maleic anhydride complex Ru(η2-C4H2O3)(CO)(CN-p-tolyl)(PPh3)2

Article abstract of DOI:10.1016/0022-328X(89)87148-7

The structure of the maleic anhydride complex Ru(η²-C4H2O3)(CO)(CN-p-tolyl)(PPh3)2 (1) has been determined by X-ray crystallography.Crystals of 1 are monoclinic, space group P2₁/c, a 9.917(1), b 20.244(3), c 20.768(3) Angstroem, β 99.80(1) deg.Z = 4, D_c 1.406 g cm^-3.The structure was solved by conventional Patterson and Fourier techniques and refined by full matrix least squares.The refinement converged to R = 0.061, R_w = 0.063.The geometry about ruthenium is approximately trigonal bipyramidal with the maleic anhydride and the two triphenylphosphines equatorial.The maleic anhydride coordinates to ruthenium via the alkene (C(1)-C(4)) bond.The elongated C(1)-C(4) bond and the values of ν(C(*)N) and ν(C(*)O) in the infrared spectrum suggest a strong alkene ?-acceptor component in the Ru-maleic anhydride interaction.