吉林大学Zong-Quan Wu课题组近日取得一项新成果。经过不懈努力，他们实现了圆极化发光的环状螺旋聚合物的可控合成。2022年5月6日出版的《德国应用化学》发表了这项成果。

在这项研究中，研究人员报道了可以引发异腈活性扩环聚合的手性环状钯(II)催化剂，该反应生成一种单手性环状螺旋聚(苯异腈)，并具有可预测的分子量和低分散度，且产率上佳。使用这种方法，研究人员通过在上接枝的策略制备了环状瓶刷样聚合物，并用多种光谱数据和原子力显微镜观测确认了该环状拓扑。进一步研究表明，这种含一个单手性螺旋状骨架的环形聚合物刷表现出有趣的光致发光和圆极化发光性能。

据了解，环状聚合物由于其非开放结构和独特性能吸引了许多关注，然而，环状聚合物的合成困难，这阻碍了它们的功能和应用。

附：英文原文

Title: Controlled Synthesis of Cyclic-Helical Polymers with Circularly Polarized Luminescence

Author: Lei Xu, Bao-Rui Gao, Xun-Hui Xu, Li Zhou, Na Liu, Zong-Quan Wu

Issue&Volume: 2022-05-06

Abstract: Cyclic polymers attract attention because of their endless structure and unique properties, which differ from the linear analogs. However, the synthesis of cyclic polymers is difficult and prohibits their functions and applications. In this study, we reported chiral cyclic Pd(II)-catalysts that initiate a living ring-expansion polymerization of isocyanides, yielding a single-handed cyclic-helical poly(phenyl isocyanide), with predictable molecular weight (M  n) and low dispersity (M  w/M  n), in good yield. Using this method, cyclic bottlebrush polymers were prepared via the grafting-onto strategy. The cyclic topology was confirmed using various spectroscopic data and atomic force microscope observation. Moreover, the cyclic polymer brushes, comprising of a one-handed helical backbone, showed interesting photoluminescence and circularly-polarized luminescence.

DOI: 10.1002/anie.202204966

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202204966