The structure of the title compound, pentane-1,5-diammonium aluminium(III)
hydrogen bis(phosphate), (C5H16N2)[AlP2O8H], obtained solvothermally at 473
K, has been determined by single-crystal X-ray diffraction. It consists of
one-dimensional [AlP2O8H](2-) macroanions, connected to each other by pent
anediammonium cations. Contrary to similar compounds with P/Al = 2, the thr
ee-dimensional structure is mainly obtained via a network of hydrogen bonds
.