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Figure 3
The crystal packing modes in the structures of (I)[link] and (II)[link], showing (a) the anionic ribbons joined by the 4-amino­pyridinium cations to form a three-dimensional structure, and (b) the double layers made up from anionic chains in a head-to-head arrangement with NH4+ cations and water mol­ecules located between them. O—H⋯O and N—H⋯O hydrogen bonds are shown with dashed lines. Water mol­ecules in (I)[link] have been omitted for clarity; the shaded tetra­hedra represent the phos­phon­ate groups. Symmetry codes for (II)[link] are given in Table 4[link].

Journal logoSTRUCTURAL
CHEMISTRY
ISSN: 2053-2296
Volume 65| Part 6| May 2009| Pages o261-o266
doi:10.1107/S0108270109010683
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