A method for synthesising open-framework phosphates under less-severe conditions than those employed in conventional solvothermal processes is described. Two new layered aluminum phosphates containing pyridine and imidazole templates and their gallium analogues have been grown in silica gel at room temperature, and the structures determined by single-crystal X-ray diffraction. Crystal data: general formula (C 5 NH 6 )[M(HPO 4 ) 2 (H 2 O) 2 ], triclinic, space group P 1̄, lattice parameters a = 6.994(1), b = 7.2208(7), c = 12.114(1) Å, α = 105.080(8), β = 104.85(1), γ = 90.39(1)° when M = Al; a = 7.056(1), b = 7.315(1), c = 12.165(1) Å, α = 105.32(1), β = 105.49(1), γ = 90.25(1)° when M = Ga. General formula (C 3 N 2 H 5 )[M(HPO 4 ) 2 (H 2 O) 2 ], monoclinic, space group C 2/ c, a = 21.893(1), b = 7.1830(3), c = 6.9890(5) Å, β = 104.164(5)° when M = Al; a = 22.002(2), b = 7.262(1), c = 7.047(1) Å, β = 105.11(1)° when M = Ga. The four structures are closely related and contain MO 6 (M = Al, Ga) and PO 4 polyhedra linked to form corrugated layers. The pyridinium or imidazolium cations occupy sites between these layers and are linked through hydrogen bonding to one or two adjacent layers, respectively.
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Leech et al. (1998) studied this question.