Abstract

Abstract71Ga and 27Al NMR and clay mineral pillaring studies were used to investigate the hydrolysis of Al(H2O)–Ga(H2O) solutions, mixed in an Al:Ga mole ratio of 12:1, and confirmed the formation of the previously proposed GaO4Al12(OH)24(H2O) polyoxycation. This species has been found to be formed in marked preference to both AlO4Al12(OH)24(H2O) and the previously identified GaO4Ga12(OH)24(H2O) ions, and further to have a much higher thermal stability in solution than either of these. It is suggested that the reason for the increased stability of the ‘GaAl12’ species is that the substitution of a larger metal into the central tetrahedral position has resulted in the formation of a less distorted structure.

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