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9-Cobalt(II)-Containing 27-Tungsto-3-germanate(IV): Synthesis, Structure, Computational Modeling, and Heterogeneous Water Oxidation Catalysis
31
Citations
67
References
2019
Year
The 9-cobalt(II)-containing trimeric, cyclic polyanion [Co<sub>9</sub>(OH)<sub>3</sub>(H<sub>2</sub>O)<sub>6</sub>(PO<sub>4</sub>)<sub>2</sub>(<i>B-α-</i>GeW<sub>9</sub>O<sub>34</sub>)<sub>3</sub>]<sup>21-</sup> (<b>1</b>) was synthesized in an aqueous phosphate solution at pH 8 and isolated as a hydrated mixed sodium-cesium salt. Polyanion <b>1</b> was structurally and compositionally characterized in the solid state by single-crystal X-ray diffraction, Fourier transform infrared spectroscopy, as well as thermogravimetric and elemental analyses. The magnetic and electrochemical properties of <b>1</b> were also studied and compared with those of its phosphorus analogue, [Co<sub>9</sub>(OH)<sub>3</sub>(H<sub>2</sub>O)<sub>6</sub>(HPO<sub>4</sub>)<sub>2</sub>(<i>B-α-</i>PW<sub>9</sub>O<sub>34</sub>)<sub>3</sub>]<sup>16-</sup> (<b>Co</b><sub><b>9</b></sub><b>-P</b>). The electrochemical water oxidation activity of the cesium salt of <b>1</b> under heterogeneous conditions was also studied and shown to be superior to that of <b>Co</b><sub><b>9</b></sub><b>-P</b>. The experimental results were supported by computational studies.
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