Crystal Structure of the Axial ( Orange - Yellow ) Isomer of Bis ( methy ldiphenylphosphine ) tetrakis ( trifluoroacetato ) dimoly bdenum

( 1 ) O to the least-squares plane of the acac ring. Bond distance between the CY and P carbons of the naphthalene ring are shorter than the P-P bonds observed in other naphthalene derivatives. lo The naphthalene ring inclines slightly as the benzo group approaches N(2), and their dihedral angle is 87.6 (1)' to the least-squares plane of the acac ring. Since the inclination of the aromatic ring results in only a slight change in the direction of polarization, it seems to contribute