CN3H6·Al(HPO4)2·2H2O, prepared by hydrothermal methods at 120 °C, contains infinite
stacks of guanidinium cations (intermolecule C···C separation ∼3.5 Å) interleaving a
distinctive anionic aluminophosphate layer topology based on polyhedral eight-rings of vertex-sharing AlO4(OH2)2 octahedra and HPO4 tetrahedra. Crystal data: CN3H6·Al(HPO4)2·2H2O,
M
r = 315.05, orthorhombic, Pnma (No. 62), a = 6.965(2) Å, b = 20.624(4) Å, c = 7.168(2) Å,
V = 1029.7(5) Å3, Z = 4, R = 3.42%, R
w = 3.40% [85 parameters, 829 observed reflections
with I > 3σ(I)].