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A Bicadmium-Substituted Polyoxometalate Network Based on a Vanadosilicate Cluster for the Selective Oxidation of Styrene to Benzaldehyde
23
Citations
32
References
2020
Year
A new bicadmium-substituted vanadosilicate, [Cd(en)<sub>2</sub>]<sub>2</sub>[(en)<sub>2</sub>Cd<sub>2</sub>Si<sub>8</sub>V<sub>12</sub>O<sub>40</sub>(OH)<sub>8</sub>(H<sub>2</sub>O)<sub>0.5</sub>]·5H<sub>2</sub>O (<b>1</b>; en = ethylenediamine), had been hydrothermally synthesized and characterized. Structural analysis revealed that the kind of new [(en)<sub>2</sub>Cd<sub>2</sub>Si<sub>8</sub>V<sub>12</sub>O<sub>40</sub>(OH)<sub>8</sub>(H<sub>2</sub>O)<sub>0.5</sub>]<sup>4-</sup> polyoxoanionic cluster was derived from the classical {V<sub>18</sub>O<sub>42</sub>} cluster by replacing six {VO<sub>5</sub>} square pyramids with four {Si<sub>2</sub>O<sub>7</sub>} and two [Cd(en)]<sup>2+</sup> groups. Notably, such mixed substitution of both main-group and transition metals in polyoxovanadates is much less developed. Furthermore, compound <b>1</b> displays efficient catalytic activity toward the selective oxidation of styrene to benzaldehyde with a conversion of 97% and a selectivity of 87% in 8 h.
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