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Synthesis and photo-/electro-catalytic properties of a 3D POMOF material based on an interpenetrated copper coordination polymer linked by in situ dual ligands and Dawson-type phosphotungstates

DOI

39

Citations

74

References

2017

Year

Lingyu Fan, Kai Yu, Jinghua Lv, He Zhang, Zhanhua Su, Lu Wang, Chunmei Wang, Baibin Zhou
Dalton Transactions

Abstract

A novel 3D polyoxometalate metal organic framework (POMOF), [{CuCu (H<sub>2</sub>O)<sub>5</sub>(pzc)<sub>10</sub>(pz)<sub>6</sub>}{P<sub>2</sub>W<sub>18</sub>O<sub>62</sub>}<sub>2</sub>]·4H<sub>2</sub>O (1) (Hpzc = pyrazine-2-carboxylic acid, pz = pyrazine) has been hydrothermally synthesized and characterized by IR, TG, XRD, UV-vis and elemental analyses. In compound 1, the pzc and pz ligands are generated through in situ transformation from pyrazine-2,3-dicarboxylic acid (pzdc) to remove one or two CO<sub>2</sub> molecules. The ligands with four coordination modes connect nine crystallographically independent Cu atoms to form a super-big circle unit. Each ring unit is connected to the adjacent six rings via an edge-sharing way to form a 2-D Cu/pz/pzc MOF layer, which is further extended along two spatial directions by two kinds of insert modes to generate an interpenetrating and staggered 3-D metal organic network. The {P<sub>2</sub>W<sub>18</sub>} clusters as nine-node inorganic guest molecules are grafted on the Cu/pz/pzc framework forming a complex 3D POMOF with a new topology {4·6·8<sup>3</sup>·10}<sub>2</sub> {4·6·8}<sub>2</sub> {4·6<sup>2</sup>·8<sup>2</sup>·10}<sub>2</sub>{4·6<sup>3</sup>·8<sup>2</sup>}<sub>2</sub>{4·8<sup>5</sup>}<sub>2</sub>{4<sup>2</sup>·6<sup>2</sup>·8<sup>2</sup>}<sub>2</sub>{4<sup>2</sup>·6<sup>3</sup>·8}{4<sup>3</sup>·6<sup>7</sup>·8<sup>13</sup>·10<sup>10</sup>·12<sup>3</sup>}<sub>2</sub> {4}<sub>6</sub>{6·8<sup>2</sup>}<sub>2</sub>{6<sup>2</sup>·8}<sub>2</sub> {6<sup>4</sup>·8·10}{6}<sub>2</sub>{8}<sub>4</sub>. Additionally, compound 1 exhibits good electrocatalytic activity for the reduction of H<sub>2</sub>O<sub>2</sub> and effective photocatalytic degradation ability for three azo dyes under UV irradiation.

References

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