A novel polyoxometalate-encapsulating 3D polycatenated metal-organic framework.

A novel polyoxometalate-encapsulating polycatenated metal-organic framework, (bib) 0.5 [Cu 2 (bib) 3.5 (GeW 12 O 40)]·H 2 O (1) (bib = 1,4-bis(1-imidazol-yl)-2,5-dimethyl benzene), has been synthesized under hydrothermal conditions. In compound 1 , 1D molecular ladders and 2D square grid layers is further catenated to the two adjacent such motifs in inclined fashion to give an 1D+2D → 3D polycatenaned metal-organic framework with nanotube channels, in which nanosized Keggin anions as guests are encapsulated for the first time. Compound 1 represents a first case of Keggin-type polyoxometalate-encapsulating 1D+2D→3D polycatenated metal-organic framework. The electrochemical studies show that modified electrode of 1 exhibits highly efficient electrocatalytic activity toward reduction of inorganic molecule bromate (BrO 3 -). The electrocatalytic reaction mechanism of 1 -GCE toward reduction of BrO 3 - has been illuminated. The photoluminescence property of 1 was also investigated. A novel polyoxometalate-encapsulating 1D+2D→3D polycatenated metal-organic framework has been synthesized. The modified electrode of compound 1 exhibits highly efficient electrocatalytic activity toward reduction of bromate (BrO 3 -). Image 1 • A novel polyoxometalate-encapsulating polycatenated metal-organic framework is synthesized and structurally characterized. • Compound 1 represents a first case of Keggin-type polyoxometalate-encapsulating 1D+2D.→3D polycatenated metal-organic framework. • The modified electrode of compound 1 exhibits highly efficient electrocatalytic activity toward reduction of bromate. [ABSTRACT FROM AUTHOR]