STRUCTURE OF (MU-3-CCL)CO3(CO)7(MU-DPPM) - A CHLOROALKYLIDYNE CAPPED TRICOBALT CLUSTER WITH A BIDENTATE BIS(DIPHENYLPHOSPHINO)METHANE LIGAND BRIDGING ONE EDGE OF THE TRICOBALT TRIANGLE

Heptacarbonyl-mu-3-chloromethylidyne-mu-2-[methanediylbis(diphenylphosphino)-P,P']tricobalt-(3Co-Co) isopentane solvate, [Co3(CCl)(C25H25P2)-(CO)7].C5H12, M(r) = 876.83, triclinic, P1BAR, a = 12.050 (6), b = 12.758 (6), c = 13.076 (6) angstrom, alpha = 95.88 (3), beta = 101.12 (3), gamma = 100.55 (3)-degrees, V = 1919 (1) angstrom 3, Z = 2, D(x) = 1.52, D(m)(flotation) = 1.49 g cm-3, lambda(Mo K-alpha) = 0.7107 angstrom, mu(Mo K-alpha) = 14.71 cm-1, F(000) = 892, T = 295 K, R = 0.054 for 4774 independent reflections with I > 3-sigma(I). (mu-3-CCl)Co3(CO)7(mu-dppm) is the product of the reaction of bis(diphenylphosphino)methane (dppm) and chloroalkylidynenonacarbonyltricobalt (mu-3-CCl)Co3-(CO)9. A disordered solvent molecule (isopentane) was included in the calculations using back Fourier transform methods. The structure contains a triangle of Co atoms capped by the chloroalkylidyne unit, and with one of the edges of the Co triangle bridged by the dppm unit. The Co-Co distances range from 2.483 (1) to 2.492 (1) angstrom. The other dimensions of major interest are Co-P 2.200 (3) angstrom and Co-C(Cl) which range from 1.901 (5) to 1.858 (3) angstrom.