Studies of β-Diketone Complexes of Rhenium. VII. The Crystal and Molecular Structure of Oxodichloropentane-2,4-dionatotriphenylphosphinerhenium(V)

The crystal structure of oxodichloropentane-2,4-dionatotriphenylphosphinerhenium(V) has been studied by single crystal X-ray methods. The crystals are triclinic with lattice parameters a = 11.023(8) A, b = 13.523(8) A, c = 9.360(7) A, α = 90.2(1)°, β = 114.1(1)°, γ = 67.7(2)°. The space group is and there are two formula weights per unit cell. A total of 2891 reflections, of which 2447 were observed, were examined, and the structure was refined by full matrix least squares to an R2 value of 0.0782. The ligands are arranged around the rhenium atom such that the nearest six atoms are at the corners of a very distorted octahedron. Most of this distortion appears to be caused by nonbonding repulsive interactions. The short oxo–phosphine distance, 2.85(1) A, suggests the possibility of a weak bonding interaction. Observed bond distances (Re—Cl, 2.35 A av; Re—O(oxo), 1.69(1) A; Re—O(diketone), 1.99(1), 2.10(1) A; Re—P, 2.431(4) A) are close to those observed previously in similar compounds.