基于偶氮苯聚合物的超分子手性开关

Supramolecular Chiroptical Switches Based on Azobenzene Polymers

手性聚合物的研究对于理解生命过程和制备智能材料具有重要的指导意义.作为一类典型的光响应性发色团,将偶氮苯基团引入到手性聚合物体系中,能够赋予聚合物光手性开关特性.相比于传统的利用手性单体共价聚合的方式,利用超分子手段实现聚合物手性诱导是一种更为简便、高效、智能、廉价的方式.本文从偶氮苯基手性聚合物的构筑方法入手,介绍不同构筑策略对于超分子手性开关行为的影响,并且总结了不同构筑策略的优势与特点.最后指出在偶氮苯基聚合物的超分子手性开关领域存在的关键科学问题和未来研究中的挑战.

The study of chiral polymers has important guiding significance for understanding life processes and preparing smart materials.As a typical photo-responsive chromophore,the introduction of azobenzene groups into chiral polymer systems can endow polymers with optical chirality switch characteristics.Compared with the traditional covalent polymerization by chiral monomers,the use of supramolecular strategy means is a more convenient,efficient and intelligent way to induce polymer chirality.Generally speaking,inducing polymer chirality by supramolecular means can often avoid the use of expensive chiral reagents to save costs,and it can also endow polymer systems with more excellent chirality properties.In recent years,chiral polymers in biomimetic materials,asymmetric catalytic materials and chiral optical devices have shown great application prospects,and promote the interest of scholars in this field.Based on the above background,this paper is classified by the construction methods of azobenzene-based chiral polymers such as chiral monomers,chiral end groups,chiral solvents,chiral gel factors,circularly polarized light and chiral host macrocycles.Then,the effects of different construction strategies on the supramolecular chirality switches are mainly introduced,and the advantages and characteristics of different construction strategies are also summarized.Finally,at the end of this paper,we point out the key scientific issues and challenges in future research of supramolecular chirality switching based on azobenzene polymers.