Aluminium-27 MAS NMR studies of sodium aluminates and aluminium hydroxides (OH/AI = 5.3–3.9) formed through varying degrees of acid hydrolysis have revealed four-and-six coordinate aluminium species, suggesting the formation of complex polyoxoanion and/or polymeric intermediates in alkaline solution.
S. M. Bradley and J. V. Hanna, J. Chem. Soc., Chem. Commun., 1993, 1249 DOI: 10.1039/C39930001249
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