Temperature-dependent assembly of two 3D [BW12O40]5−-based coordination polymers with visible light driven photocatalytic properties

Abstract

Two new 3D coordination polymers, namely, [Cu^II₃Cl(BBTZ)₅(BW₁₂O₄₀)(H₂O)₂]·6H₂O (1) and [Cu^I₃Cu^II(BBTZ)₅(BW₁₂O₄₀)(H₂O)]·H₂O (2) (BBTZ = 1,4-bis(1,2,4-triazol-1-lmethyl)benzene), have been successfully synthesized under hydrothermal conditions. Compound 1 is a 3D architecture with octa-nuclear water clusters while compound 2 is a 1D + 3D → 3D interpenetrated framework, which represents the first example of a POM-based coordination polymer with the co-existence of self-catenation and poly-threading. The structure–property correlations between the title compounds have been discussed. Compound 2 with narrow band-gap size exhibits more favorable efficiency of photocatalytic activity under visible light irradiation than compound 1.