Synthesis and characterization of APDAP(12)-150, a layered aluminophosphate templated with 1,2-diaminopropane

The synthesis, crystal structure and characterization of the novel layered aluminophosphate APDAP(12)-150 prepared in the presence of 1,2-diaminopropa ne (DAP(12)) are reported. It has the composition (C3N2H12)[AlPO4(OH)](2 .) H2O and crystallizes in space group Pca2(1) (no. 29) with a = 9.983(12), b = 6.691(6) and c = 18.606(14) Angstrom. The layers consist of single [-Al-O (H)-Al-] chains containing only 5-coordinate aluminum. These chains are lin ked via three of the four P-O bonds of PO4 tetrahedra. The fourth bond is a P=O bond, which forms hydrogen bridges to the doubly protonated DAP(12) mo lecules, located between the layers. The structure is closely related to th at of the previously reported materials UiO-15 and APDAP-150 but differs in the coordination of aluminum species. An extra-framework water molecule is present at two distinct crystallographic positions with occupancies of 1/3 and 2/3. Solid-state NMR spectroscopy shows that this molecule modities th e environment of one of the aluminum atoms. APDAP12-150 is the third exampl e of a layered aluminophosphate with a molar ratio P/Al=1 and containing on ly 5-coordinate aluminum in the as-synthesized form (UiO-13 and UiO-14 are the other two). (C) 2000 Elsevier Science B.V. All rights reserved.