近日，瑞士伯尔尼大学Robert Haner小组报道了来自两亲性磷酸二酯连接偶氮苯三聚体的刺激响应超分子聚合物。2021年9月16日出版的《德国应用化学》发表了这项成果。

一种两亲性磷酸二酯连接偶氮苯三聚体已在刺激响应的水溶性超分子聚合物的开发中使用。在乙醇溶液中，Z和E的异构体之间能发生可逆的热和光异构化。研究人员用光谱和显微技术研究了其在水介质中的自组装性能，结果表明E-和Z-偶氮苯三聚体分别能形成超分子纳米片和环形纳米结构。由于三聚体偶氮苯单元的E/Z光异构化，这两种不同的超分子形态可以在光辐射下切换。

这一发现为开发具有刺激响应性的水溶性超分子聚合物铺平了道路，该聚合物在构建智能功能材料和生物应用方面具有广阔的前景。

附：英文原文

Title: Stimuli-responsive supramolecular polymers from amphiphilic phosphodiester-linked azobenzene trimers

Author: Robert Haner, Oleh Vybornyi, Shi-Xia Liu

Issue&Volume: 2021-09-16

Abstract: An amphiphilic phosphodiester-linked azobenzene trimer has been exploited in the development of stimuli-responsive water-soluble supramolecular polymers. It can reversibly undergo thermal and photoisomerization between  Z  and  E  isomers in EtOH solution. Its self-assembly properties in aqueous medium have been investigated by spectroscopic and microscopic techniques, demonstrating that  E  - and  Z  -azobenzene trimers form supramolecular nanosheets and toroidal nanostructures, respectively.  By virtue of the  E  /Z photoisomerization of azobenzene units of the trimer, these two different supramolecular morphologies can be switched upon photoirradiation. This finding paves the way towards stimuli-responsive water-soluble supramolecular polymers which hold great promise in the construction of smart functional materials and also in biological applications.

DOI: 10.1002/anie.202108745

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202108745