Development of on-off controllable photochromic dinuclear ruthenium complexes by redox switch

吡嗪桥联双核钌配合物在可见光照射下通过桥联配体的选择性解离而在溶液中显示颜色变化。双核配合物显示光致变色行为，因为它们通过加热恢复。在本研究中，我们合成了含有氧化还原响应开关基团的双核配合物，如苯醌和对苯二酚，并测量了这些配合物的光解速率。发现含苯醌结构的双核配合物的光解速率受到抑制。这一结果表明，本研究所开发的配合物在制备新型光致变色材料中的应用是可行的。

Pyrazine-bridged dinuclear ruthenium complexes show color change in solution by selective dissociation of the bridging ligand under visible-light irradiation. The dinuclear complexes display photochromic behavior, since they are recovered by heating. In this study, we synthesized the dinuclear complexes having redox responsive switchingmoieties, such as benzoquinone and hydroquinone, and the photodissociation rates of these complexes have been measured. It was found that the photodissociation rate of thedinuclear complexes having benzoquinone moieties was depressed. The observation suggests that the application of the complexes developed in this study to the new photochromic material which is controllable by external factor would be possible.