[C9H20N][Al2(HPO4)2(PO4)]:: An aluminium phosphate with a new layer topology

A new two-dimensional aluminophosphate, [C9H20N] [Al-2(HPO4)(2)(PO4)] has been synthesized under solvothermal conditions at 453 K in the presence of 2,2,6,6,- tetramethylpiperidine and the structure determined using room-temperature single-crystal X-ray diffraction data (M-r = 483.16, triclinic, space group P-1, a = 8.541(3), b = 9.298(1), c = 12.660(5)Angstrom, alpha = 73.26(2), beta = 89.58(4), and gamma = 87.70(2)degrees; V = 962.06 Angstrom(3), Z = 2, R = 3.88%, and R-w = 4.47% for 2049 observed data (I > 3(sigma(I))). The structure has a new framework topology and contains AlO4 and PO4 tetrahedra linked to generate layers containing 4- and 8-membered rings of alternating aluminium- and phosphorus-based polyhedra. The organic cations reside between the layers and are hydrogen bonded to the inorganic framework. The layer topology is closely related to that observed previously in the pyridine-containing AlPO, [C5H6N][Al-2(HPO4)(2)(PO4)]. (C) 1999 Academic Press.