A 3-D Wells–Dawson phosphotungstate hybrid material modified by Na<sup>+</sup> and a bi-copper organic complex linker, and its photo-/electro-catalytic properties

<p>An inorganic–organic hybrid material based on Dawson polyoxometalates, [Na<sub>2</sub>{Cu<sup>I</sup><sub>2</sub>(bim)<sub>2</sub>}<sub>2</sub>(P<sub>2</sub>W<sub>18</sub>O<sub>62</sub>)]·2H<sub>2</sub>O (bim = biimidazole) (<b>1</b>), has been hydrothermally synthesized and fully characterized. In <b>1</b>, each {P<sub>2</sub>W<sub>18</sub>} cluster as a hexa-node ligand connects to six adjacent Dawson clusters via six Na1 ions to generate a pure inorganic 2-D layer, further joined by bimetal–organic segments [Cu<sub>2</sub>(bim)<sub>2</sub>]<sup>2+</sup> to form a 3-D inorganic–organic hybrid framework with channels. The structure can be simplified to 3,8-connected 3-D networks with (4<sup>3</sup>)(4<sup>18</sup>·6<sup>24</sup>·8<sup>3</sup>) topology, which shows bifunctional electrocatalytic performance for oxidation of ascorbic acid (AA) and reduction of nitrite (NO<sub>2</sub><sup>−</sup>), and high-efficient degradation ability for three typical dyes under UV light irradiation.</p>