STRUCTURE OF TRIMETHYLPLATINUM(IV) WITH A TRIPOD LIGAND

[1(eta5)-cyclopentadienyl]-tris-mu-(dimethyl-phosphito-1kappaP:2kappaO)(trimethyl-2kappa3 C)cobaltplatinum, [CoPt(C2H6O3P)3(C5H5)(CH3)3], M(r) = 691.35, triclinic, P1BAR, a = 9.106 (3), b = 14.803 (3), c = 15.147 (3) angstrom, alpha = 112.95 (2), beta = 103.68 (2), gamma = 95.10 (2)-degrees, V = 1788.9 (9) angstrom3, Z = 3, D(x) = 1.93 g cm-3, lambda(Mo Kalpha) = 0.71073 angstrom, mu = 68.69 cm-1, F(000) = 1014, room temperature, R = 0.038 for 4620 reflections with F(o)2 > 3sigma(F(o)2). The trimethylplatinum(IV) completes octahedral coordination by bonding to three O atoms of the tripod-shaped methoxy Klaui ligand. There are two independent molecules in the cell, one disordered about a center of symmetry. The ordered molecule has normal bond distances and angles; Pt-C = 2.001 (11) and Pt-O = 2.173 (5) angstrom. Many distances in the disordered molecule are uncertain, particularly in the areas of the Cp C atoms and the CH3 groups, which overlap in the two orientations.