A radical interaction has been employed as the recognition motif in the template‐directed synthesis of a [2]rotaxane composed of cyclobis(paraquat‐p‐phenylene) and a viologen derivative. The ruthenium tris(bipyridine)/triethanolamine system is used as the electron‐transfer photocatalyst to generate the necessary radical cation components that result in the formation of an inclusion complex. A stoppering reaction follows to form the mechanical bond.

中文翻译：

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通过自由基模板形成机械键

在由环双（百草枯-对-亚苯基）和紫精衍生物组成的[2]轮烷的模板指导合成中，自由基相互作用被用作识别基序。三（联吡啶）/三乙醇胺钌体系用作电子转移光催化剂，可生成必要的自由基阳离子组分，从而导致形成包合物。随后发生终止反应以形成机械结合。