Abstract
It has been found by means of 27Al NMR spectroscopy that the nature of the ionic species produced during hydrolysis of an aluminum salt solution depends strongly upon the way in which hydrolysis is carried out. Thus whereas relatively fast hydrolysis with sodium carbonate produces ultimately and solely the polymeric cation AIO 4Al 12(OH) 24(H 2O) 12 7+, hydrolysis with aluminum metal produces only a little of this cation, but predominantly two species containing aluminum in tetrahedral and octahedral environments whose structure is unknown.
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