Aluminium-27 nuclear magnetic resonance studies of the hydrolysis of aluminium(III). Part 6. Hydrolysis with sodium acetate
- 1 January 1984
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 5,p. 981-984
- https://doi.org/10.1039/dt9840000981
Abstract
If acetate anions are added to aluminium salt solutions, they are protonated by the strong acid [Al(H2O)6]3+ which itself polymerises to form the dimer cation [(H2O)4Al(µ-OH)2Al(H2O)4]4+ which loses two further protons. This is the only hydrolysis product detected and no evidence was obtained for the presence of the tridecameric polymeric cation in such solutions. If acetate is added to the extent that the ratio [MeCO2 –]/[Al3+] is greater than 1.5, then acetate groups become attached to the dimer cation to form a complex which is presumably the precursor of the dialuminium dihydroxo tetra-acetate which is known to precipitate from aluminium acetate solutions. Changes in the 27Al linewidths of the species observed provide a useful measure of the rates of the exchange processes present.Keywords
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