Structure and chirality of (-)546-bis(2,4-pentanedionato)(3-formyl-2,4-pentanedionato)cobalt(III)

[Co(CsHTO2)2(C6H703)], Mr=384.27, trigonal, P3221, a=12.094(3), c=11.144(3)Å, V=1411.6(7)Å3, Z=3, D'n=1-35'9/~8 Dx=1.357gcm-3, lambda(MoKa)=0-7107A, mu=9.8cm-1, F(000)=600, T=300K, final R=0.034 for 1677 unique reflections. The (-) isomer has the A chirality and the Co atom is chelated in a distorted octahedron by the three ligands. Molecular symmetry contains a twofold axis parallel to the x axis: the formyl group is outside the plane of the formylate ligand (with twofold disorder) and is responsible for a perturbation in the chelate ring.