Polyoxometalate immobilization in CuI/Ag–pz porous coordination polymers: The influences of them on the structural properties of frameworks

Three new high dimensional CuI/Ag–pz porous coordination polymers (PCPs) with different Keggin polyoxometalate templates have been hydrothermally synthesized: [CuI5(pz)6Cl][HPMoVI10MoV2O40] (1) [Ag5(pz)7(BW12O40)] (2) and [CuI5(pz)6H(H2W12O40)]·4H2O (3) (pz=pyrazine). The choice of the particular Keggin POM templates is shown to influence the structural properties of the Cu/Ag PCPs. Compound 1 shows a Cl-bridged Cu–pz–Cl double layer, between which two kinds of [HPMoVI10MoV2O40]4−(PMo12) polyanions are located. Compound 2 presents a 3D Ag–pz framework with parallelogram-like voids, into which BW12O405− (BW12) Keggin ions are incorporated. Compound 3 contains a Cu–pz cationic layer framework, between which are located [H(H2W12O40)]5− (W12) Keggin ions. Primary photocatalytic experiment indicates that compound 1 presents excellent photocatalytic activity. The photoluminescence properties and electrochemistry properties of the compounds are also discussed.