[Cu(en)2]0.5[Al3P3O12(OH)]-aluminophosphate with zeotype AWO: Synthesis, crystal structure and phase transformation

A new aluminophosphate [Cu(en)₂]_0.5[Al₃P₃O₁₂(OH)] (denoted as AlPO-CJ53; en = ethylenediamine) with zeotype AWO topology has been synthesized under hydrothermal conditions in which the self-assembled Cu(en) ₂ ²⁺ cations in the reaction system act as the template. AlPO-CJ53 crystallizes in the monoclinic space group P2₁/n (No. 14) with a = 0.85547(11) nm, b = 1.7671(2) nm, c = 0.90500(12) nm, β = 107.725(2)°, V = 1.3031(3) nm³. Its framework consists of AlO₄(OH)/AlO₄ and PO₄ units forming 8-ring channels along the c direction, where the copper complex cations Cu(en) ₂ ²⁺ are located to neutralize the negative charges of the framework. AlPO-CJ53 transforms to AlPO₄-25 with zeotype ATV upon calcination at 400 °C.