Abstract

The discovery that trace amounts of aluminium are necessary for fluoride to exert its biological influence has lead to numerous investigations into the nature of the active fluoroaluminate complex. Many workers have postulated AlF 4 − to be this species. In this study we show that in the presence of inorganic phosphate or ADP, fluoride is not able to complex aluminium(III), but rather the species [Al(PO 4) 2H] 2− and [Al(ADP)OH] − are formed. In the absence of completing ligands, 27Al NMR reveals that octahedral, hydrated aluminium fluoride complexes are formed, the most likely one being [AlF 4(H 2O) 2] −.

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