A new two-fold interpenetrating POM-based structure modified by CdII and flexible bis(triazole) ligand

A new Keggin POM-based compound, [Cd2(H2O)2(btb)4(SiMo12O40)] (1) (btb = 1,4-bis(1,2,4-triazol-1-y1)butane), was synthesized under hydrothermal conditions. Compound exhibits 2D wave-like metal–organic layers, which are further linked by Keggin [SiMo12O40]4− anions to construct a 3D framework containing two kinds of quadrate channels. The void left by channels induces an interesting two-fold interpenetrating structure.