[H3N]
The structure of the title compound, pentane-1,5-diammonium aluminium(III) hydrogen bis(phosphate), (C(5)H(16)N(2))[AlP(2)O(8)H], obtained solvothermally at 473 K, has been determined by single-crystal X-ray diffraction. It consists of one-dimensional [AlP(2)O(8)H](2-) macroanions, connected to each other by pentanediammonium cations. Contrary to similar compounds with P/Al = 2, the three-dimensional structure is mainly obtained via a network of hydrogen bonds.
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