A novel light-responsive supramolecular polymer was demonstrated from an overcrowded alkene switch (OAS) mounted with two rigid 2-ureido-4-pyrimidinone (UPy) groups. By strong quadruple hydrogen bonding interactions, transOAS-Upy could form well-defined nanospheres in chloroform, which would be transformed into worm-like assemblies after UV irradiation. Moreover, the inverse process of this system could be achieved by exposure to heat.

中文翻译：

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过度拥挤的烯烃开关驱动的超分子聚合物的光驱动形态转变†

从拥挤的烯烃开关（OAS）中安装了两个刚性的2​​-脲基-4-嘧啶酮（UPy）基团，证明了一种新型的光响应性超分子聚合物。通过强大的四重氢键相互作用，反式OAS-Upy可以在氯仿中形成定义明确的纳米球，在紫外线照射后，该纳米球将转变为蠕虫状的组件。而且，该系统的逆过程可以通过暴露于热来实现。