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.