Pressure-Triggered Photochromism in Chiral Salicylaldehyde Schiff Bases  

作　　者：Yajing Li Jiacong Fu Bohan Yao Pengyu Zeng Qiuchen Peng Yuanyuan Li Kai Li Shuangquan Zang 

机构地区：[1]Tianjian Laboratory of Advanced Biomedical Sciences,Institute of Advanced Biomedical Sciences,College of Chemistry,Zhengzhou University,Zhengzhou,Henan 450001,China [2]School of Chemistry and Chemical Engineering,Henan University of Technology,Zhengzhou,Henan450001,China

出　　处：《Chinese Journal of Chemistry》2024年第23期2987-2992,共6页中国化学(英文版)

基　　金：supported by the National Natural Science Foundation of China(22371264,U1904172);the Excellent Young Scientist Foundation of Henan Province(202300410374);program for Science&Technology Innovation Talents in Universities of Henan Province(22HASTIT002);the Young-backbone Teacher Foundation of Colleges and Universities of Henan Province(2023GGJS062);the Natural Science Project of Zhengzhou Science and Technology Bureau(22ZZRDZX11);the Undergraduate Innovation and Entrepreneurship Training Program(202410463044);This study was supported by Center of Advanced Analysis&Gene Sequencing,Zhengzhou University.

摘　　要：Salicylaldehyde Schiff base is a kind of important photochromism system,whose photochromism process is widely acknowledged to be co-determined by the electronic structure and molecular conformation.Normally,salicylaldehyde Schiff base derivatives withα-type structures tend to exhibit photochromism while those withβ-type structures tend to be photostable.However,more and more counterexamples are found,and the root cause of photochromism property of salicylaldehyde Schiff base is still unclear.In this work,a series of chiral salicylaldehyde Schiff bases and their racemates were prepared.The formers are photochromic while the latters are photostable.Influenced by Wallach's rule,the homochiral counterparts have looser packing modes than that of the racemic counterparts.Mechanism study revealed that the pressure should be the root cause of photochromism property.Close molecule packing can restrict the photochromism property effectively after being pressed,which also explains why the photochromism of salicylaldehyde Schiff base is usually observed in solid state.This work not only reports the unique photo-responsive difference between the chiral salicylaldehyde Schiff bases and their racemates,more importantly,provides a new perspective to understand the influence of molecule pressure on their photophysical properties.

关 键 词：Salicylaldehyde Schiff base PHOTOCHROMISM CHIRAL PRESSURE Wallach's rule 

分 类 号：O62[理学—有机化学]