Synthesis and characterization of a new layered aluminophosphate templated with 1,3-diaminopropane: [H3N(CH2)3NH3]0.5[AlPO4(OH)(OH2)]·H2O

Abstract

A new layered aluminophosphate has been synthesized hydrothermally in the presence of 1,3-diaminopropane and its structure solved from X-ray powder diffraction data. The compound with the composition [C₃H₁₂N₂]_0.5[AlPO₄(OH)(H₂O)]·H₂O crystallizes in the orthorhombic space group Pnma (No. 62) with a = 6.91848(11), b = 22.2989(4) and c = 9.6074(2) Å. The layers contain only 6-co-ordinated aluminium forming [–Al–(OH)–Al–] chains, and these are connected to one another via phosphorus tetrahedra. The structure of the layers is closely related to that of the layered aluminium methylphosphonate AlMepO-ζ. This compound represents the third example of layered aluminophosphates with an atomic ratio P∶Al = 1∶1. Its thermal decomposition has been monitored by X-ray diffraction and solid state NMR.