A new layered aluminophosphate [C₄H₁₂N₂][Al₂P₂ O₈(OH)₂] templated by piperazine

A new layered aluminophosphate with an Al/P ratio of unity, designated AlPO-CJ9 (CJ9: China, Jilin University, number 9), has been synthesized hydrothermally. The crystalline product is characterized by powder and single-crystal X-ray diffraction (XRD), FT-IR and thermogravimetric analyses. The structure of AlPO-CJ9 contains [Al₂P₂O₈(OH)₂]^2- macroanionic sheets stacked in an AAAA sequence. The inorganic layer based on a 3 × 4 × 6 net is featured by a type of chain built up by corner-sharing three-membered rings. The nonbonding interaction energies (E_inter), including H-bonding, van der Waals and Coulombic interactions between the inorganic layer and several organic amines are studied, which are valuable in evaluating the templating abilities of the organic templates.