A new open-framework indium phosphate–phosphite containing intersecting extra-large 16-ring channels

A new open-framework indium phosphate–phosphite [In9(H2O)6(HPO3)13(H2PO3)2(PO4)(HPO4)][(C6N2H18)3] (InHPO-CJ1) has been hydrothermally synthesized by using 2-methyl-1,5-pentanediamine (MPMD) as the structure-directing agent. It presents a unique pillar-layer framework topology containing three-dimensional intersecting extra-large 16-ring channels. 31P MAS NMR has been studied to confirm the four different coordinations of P atoms in the as-synthesized compound.