Crystal and molecular structure of tris-(8-quinolinolato)aluminium(III) containing occluded acetonylacetone

Abstract

The title compound, prepared in aqueous acetone, crystallizes in the monoclinic space group P2₁/n, with a=10.935(2),b=13.190(3),c=16.869(5) Å,β=98.43(2)° andZ=4. The structure was solved by direct methods and refined by full matrix least squares methods toR=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.