Abstract
Two new polyoxometalate-templated supramolecular compounds, [CuI4(bpmb)4][PMoVI11MoVO40] (1) and [CuI4(bpmb)4SiW12O40] (2) (bpmb = 1,4-bis(pyrazol-1-ylmethyl)benzene), have been synthesized under hydrothermal conditions and characterized by routine methods. Structural analysis shows that in 1, there exist crown-like [CuI4(bpmb)4] coordination macrocycles, and the Keggin polyanions [PMo VI11MoVO40]4− (abbr. as PMo12), which direct the crown-like macrocycle to form a 3-D supramolecular framework. In 2, there exist unusual meso-helix chains, and these chains are mutually interlaced in a wave–trough pattern, but without intersection resulting in a multi-cavity layer, in which the [SiW12O40]4− (abbr. as SiW12) clusters as guest molecules occupy the cavities of the layers. The distinct structural features of the two compounds suggest that Keggin polyanions should play a significant role in the process of assembly. Electrocatalytic properties of 1 and 2 were investigated.
Graphical Abstract
Two new POM-templated supramolecular compounds with good electrocatalytic activities toward reduction of iodate have been obtained, which shows that Keggin anions should play a significant role in the process of assembly.