CRYSTAL AND MOLECULAR-STRUCTURE OF TRIS-(8-QUINOLINOLATO)ALUMINIUM(III) CONTAINING OCCLUDED ACETONYLACETONE

The title compound, prepared in aqueous acetone, crystallizes in the monoclinic space group P2(1)/n, with a = 10.935(2), b = 13.190(3), c = 16.869(5) angstrom, beta = 98.43(2)-degrees- and Z = 4. The structure was solved by direct methods and refined by full matrix least squares methods to R = 0.057 for 1968 observed reflections. The complex is in the meridional conformation, with the Al atom coordinated to the bidentate 8-quinolinolato ligands in a distorted octahedral configuration. Acetone occluded in the lattice was converted to acetonylacetone during data collection; the latter was present in the ratio 0.25 molecules per mole of metal complex. The structure resembles the n-hexanol adduct of tris-(8-quinolinolato)manganese(III) with which the crystals are isomorphous.