武汉大学李振团队报道了基于吩噻嗪衍生物构象转变的新型分子光开关及其三重态发射特性。相关研究成果发表在2025年1月13日出版的国际学术期刊《美国化学会杂志》。

分子光开关研究因其在智能材料发展中的巨大潜力而在上个世纪引起了广泛关注。然而，适用于构建光响应发光材料的光开关仍然有限，特别是那些涉及三重态磷光的光开关。

该文中，研究人员设计了一种基于吩噻嗪衍生物构象转变的新型分子光开关，最大限度地减少空间位阻（CH₃>Cl>F）来调节构象转变过程，同时引入氰基苯受体来促进磷光发射电位。当它们被掺杂到聚合物基质中时，通过将不同的空间位阻基团掺入吩噻嗪或氰基苯中，并伴有光响应的室温磷光，实现了不同的光开关速率。

该项研究有望大大扩展有机光开关分子的多样性和应用。

附：英文原文

Title: New Molecular Photoswitch Based on the Conformational Transition of Phenothiazine Derivatives and Corresponding Triplet Emission Properties

Author: Mingxue Gao, Ruimin Wu, Yawen Zhang, Yunshu Meng, Manman Fang, Jie Yang, Zhen Li

Issue&Volume: January 13, 2025

Abstract: Molecular photoswitch research has drawn much attention in the last century owing to its great potential in the development of smart materials. However, photoswitches suitable for constructing light-responsive luminescent materials remain limited, especially those involving triplet-state phosphorescence. Herein, we designed a novel molecular photoswitch based on the conformation transition of phenothiazine derivatives, minimizing steric hindrance (CH3 > Cl > F) to regulate the conformation transition process while introducing a cyanobenzene acceptor to promote phosphorescence emission potential. When they were doped into a polymer matrix, varying photoswitch rates were achieved by incorporating different steric hindrance groups into phenothiazine or cyanobenzene groups, accompanied by photoresponsive room-temperature phosphorescence. This study is expected to greatly expand the diversity and applications of organic photoswitch molecules.

DOI: 10.1021/jacs.4c14920

Source: https://pubs.acs.org/doi/abs/10.1021/jacs.4c14920