C9H20N][Al2(HPO4)2(PO4)]: An Aluminium Phosphate with a New Layer Topology

A new two-dimensional aluminophosphate, [C9H20N][Al2(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 (Mr=483.16, triclinic, space group P-1, a=8.541(3), b=9.298(1), c=12.660(5) ?, =73.26(2), =89.58 (4), and =87.70(2)° V=962.06 ?3, Z=2, R=3.88%, and Rw=4.47% for 2049 observed data (I>3((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][Al2(HPO4)2(PO4)].