Heterometallic Mo–Ti oxo clusters with metal–metal bonds: Preparation and visible-light absorption behaviors
Weizhou Chen, Xiaofeng Yi, Jian Zhang, Lei Zhang
Abstract
In this work, two heterometallic clusters, namely Ti<sup>IV</sup><sub>4</sub>Mo<sup>V</sup><sub>4</sub>Mo<sup>VI</sup><sub>2</sub>O<sub>16</sub>(OCH<sub>3</sub>)<sub>16</sub> (<strong>1</strong>) and Ti<sup>IV</sup><sub>4</sub>Mo<sup>V</sup><sub>4</sub>O<sub>10</sub>(OC<sub>2</sub>H<sub>5</sub>)<sub>14</sub> (C<sub>6</sub>H<sub>5</sub>COO)<sub>2</sub> (<strong>2</strong>) are successfully constructed to improve the solar absorption and performance of titanium oxo clusters (TOCs). The <strong>1</strong> and <strong>2</strong> structures are determined well by single-crystal X-ray diffraction analysis and found to feature the common presence of Mo–Mo interactions. The solid-state UV–vis absorption studies indicate that these structures exhibit enhanced visible-light absorption and significantly reduced optical band gaps, which should be dominantly attributed to the introduction of electron-rich Mo–Mo pairs as heterometals. This work demonstrates an effective strategy of regulating the light absorption behaviors of TOCs by importing electron-rich heterometals.