2,2′-Bipyridine has been identified as a privileged ligand scaffold for photofunctional transition metal complexes. We herein report on the synthesis and photoproperties of an insulated π-conjugated 2,2′-bipyridine with a linked rotaxane structure consisting of permethylated α-cyclodextrin (PM α-CD) and oligo(p-phenylene ethynylene). The insulated π-conjugated 2,2′-bipyridine exhibited enhanced ligand performance in the solid-state emitting biscyclometalated Ir complexes and visible-light-driven Ni catalysts owing to π-extension and remote steric effects based on the linked rotaxane structure.

中文翻译：

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绝缘π-共轭2,2′-联吡啶过渡金属配合物：增强发光和催化的光性能

2,2'-联吡啶已被确定为光功能过渡金属配合物的特殊配体支架。我们在此报告了具有由全甲基化α-环糊精（PM α-CD）和寡聚（对亚苯基乙炔基）组成的连接轮烷结构的绝缘π-共轭2,2'-联吡啶的合成和光性质。由于基于连接轮烷结构的π延伸和远程空间效应，绝缘π-共轭2,2'-联吡啶在固态发射双环金属化Ir配合物和可见光驱动的Ni催化剂中表现出增强的配体性能。