First Organic–Inorganic Hybrid Compounds Formed by Ge-V-O Clusters and Transition Metal Complexes of Aromatic Organic Ligands

oleh: Hai-Yang Guo, Hui Qi, Xiao Zhang, Xiao-Bing Cui

Format: Article
Diterbitkan: MDPI AG 2022-07-01

Deskripsi

Three compounds based on Ge-V-O clusters were hydrothermally synthesized and characterized by IR, UV-Vis, XRD, ESR, elemental analysis and X-ray crystal structural analysis. Both [Cd(phen)(en)]<sub>2</sub>[Cd<sub>2</sub>(phen)<sub>2</sub>V<sub>12</sub>O<sub>40</sub>Ge<sub>8</sub>(OH)<sub>8</sub>(H<sub>2</sub>O)]∙12.5H<sub>2</sub>O (<b>1</b>) and [Cd(DETA)]<sub>2</sub>[Cd(DETA)<sub>2</sub>]<sub>0.5</sub>[Cd<sub>2</sub>(phen)<sub>2</sub>V<sub>12</sub>O<sub>41</sub>Ge<sub>8</sub>(OH)<sub>7</sub>(0.5H<sub>2</sub>O)]∙7.5H<sub>2</sub>O (<b>2</b>) (1,10-phen = 1,10-phenanthroline, en = ethylenediamine, DETA = diethylenetriamine) are the first Ge-V-O cluster compounds containing aromatic organic ligands. Compound <b>1</b> is the first dimer of Ge-V-O clusters, which is linked by a double bridge of two [Cd(phen)(en)]<sup>2+</sup>. Compound <b>2</b> exhibits an unprecedented 1-D chain structure formed by Ge-V-O clusters and [Cd<sub>2</sub>(DETA)<sub>2</sub>]<sup>4+</sup> transition metal complexes (TMCs). [Cd(en)<sub>3</sub>]{[Cd(η<sub>2</sub>-en)<sub>2</sub>]<sub>3</sub>[Cd(η<sub>2</sub>-en)(η<sub>2</sub>-μ<sub>2</sub>-en)(η<sub>2</sub>-en)Cd][Ge<sub>6</sub>V<sub>15</sub>O<sub>48</sub>(H<sub>2</sub>O)]}∙5.5H<sub>2</sub>O (<b>3</b>) is a novel 3-D structure which is constructed from [Ge<sub>6</sub>V<sub>15</sub>O<sub>48</sub>(H<sub>2</sub>O)]<sup>12−</sup> and four different types of TMCs. We also synthesized [Zn<sub>2</sub>(enMe)<sub>3</sub>][Zn(enMe)]<sub>2</sub>[Zn(enMe)<sub>2</sub>(H<sub>2</sub>O)]<sub>2</sub>[Ge<sub>6</sub>V<sub>15</sub>O<sub>48</sub>(H<sub>2</sub>O)]∙3H<sub>2</sub>O (<b>4</b>) and [Cd(en)<sub>2</sub>]<sub>2</sub>{H<sub>8</sub>[Cd(en)]<sub>2</sub>Ge<sub>8</sub>V<sub>12</sub>O<sub>48</sub>(H<sub>2</sub>O)}∙6H<sub>2</sub>O (<b>5</b>) (enMe = 1,2-propanediamine), which have been reported previously. In addition, the catalytic properties of these five compounds for styrene epoxidation have been assessed.