Multinuclear magnetic resonance studies of the hydrolysis of aluminium(III). Part 10. Proton, carbon-13, and aluminium-27 spectra of aluminium acetate at very high magnetic field

Abstract

Proton, 13C, and 27Al n.m.r. spectra together show that aluminium acetate solutions probably contain two principal species of complex cation in which the aluminium is octahedrally co-ordinated by water, hydroxide, and acetate ligands. Fine structure in the 1H n.m.r. spectra of partially deuteriated species show that each aluminium atom is co-ordinated by three water molecules and that each hydroxide interacts with many more than three water molecules. This and the quantitative data are consistent with the presence of dimeric (H2O)3Al(OH)Al(H2O)3 units with co-ordinated acetate. This may be either bridging or monodentate. Bidentate co-ordination as seen in the solid which precipitates from these solutions is much less likely.