STRUCTURE OF CARBONYL[(FERROCENECARBONYL)TRIFLUOROACETONATO-KAPPA-O,KAPPA-O]TRIPHENYLPHOSPHINERHODIUM(I)

[Rh(C14H10F3FeO2)(CO){P(C6H5)3}], M(r) = 716.28, triclinic, P1BAR, a = 10.439 (2), b = 12.605 (1), c = 13.307 (i) angstrom, alpha = 107.77 (1), beta = 100.45 (1), gamma = 107.76 (1)-degrees, V = 1513.5 (4) angstrom3 , Z = 2, D(m) = 1. 57, D(x) = 1.52 g cm-3, lambda(Mo Kalpha) = 0.71073 angstrom, mu = 11.17 cm-1, F(000) = 720, T = 298 K, final R = 0.045 for 6083 observed reflections. The title complex has a square-planar geometry about the Rh atom. The structure determination shows that the complex is formed by triphenylphosphine substitution of the carbonyl group trans to the O atom nearest to the more electronegative CF3 group (relative to the ferrocenyl group). This result is not in agreement with the expected trans influence of the two O atoms of the chelate ring; this may be explained in terms of the steric hindrance of the more bulky ferrocenyl group.