Synthesis and structural characterisation of a new layered aluminophosphate [C3H12N2][Al2P2O8(OH)2]·H2O

Abstract

A new layered aluminophosphate [C₃H₁₂N₂][Al₂P₂O₈(OH)₂]·H₂O has been synthesized hydrothermally by using racemic 1,2-diaminopropane as the structure-directing agent. Its structure, solved by single-crystal X-ray diffraction analysis, consists of [Al₂P₂O₈(OH)₂]²⁻ macroanionic sheets stacked in an ABAB sequence, and diprotonated racemic 1,2-diaminopropane cations lying between the inorganic sheets. Hydrogen bonds exist between the oxygen atoms in the sheets and nitrogen atoms of the diprotonated 1,2-diaminopropane molecules. The as-synthesized product has also been characterised by powder X-ray diffraction, inductive coupled plasma analysis, IR spectroscopy, TGA and DTA.