ADDITIONAL REACTIONS OF INORGANIC CONDENSED PHOSPHATE OLIGOMERS DURING THEIR DEGRADATION REACTIONS IN THE PRESENCE OF ALUMINUM(III) IONS

When linear di-, tri-, or tetraphosphate was degraded in the presence of Al3+, in addition to the usual degradation products, phosphates for med which possessed one more PO4 group than the parent phosphates. Thi s was confirmed by using HPLC. Tetraphosphate produced from the hydrol ysis of triphosphate in the presence of Al3+ was isolated with the use of an anion-exchange column, and its structure was ascertained by P-3 1-NMR measurement. Moreover, linear tetra-, penta- and hexaphosphates resulted from the six-membered cyclo-triphosphate in the presence of A l3+ ions. The yield of the unusual hydrolysis products of the phosphat es became maximum when an equimolar amount of Al3+ ion was used. (C) 1 998 Elsevier Science Ltd. All rights reserved.