Synthesis, crystal structure, and solid-state NMR spectroscopy of a new open-framework aluminophosphate (NH4)2AI4(PO4)4(HPO4).H2O

A new three-dimensional open-framework aluminophosphate (NH4)2AI4(PO4)4(HPO4).H2O with an AI/P ratio of4/5 is synthesized using pyridine as the solvent and 2-aminopyridine as the structure directing under solvothermal conditions. The structure was determined by single-crystal X-ray diffraction and further characterized by solid-state NMR techniques.