{"title":"Organic polymorphic crystals with multi-stimuli response: excellent mechanical elasticity, novel two-stage heterotropic photochromism and self-reversible acidichromism","authors":"Yutong Yao, Ting Wang, Hui Yu, Zhicheng Jiang, Wenbo Wu, Hongtu Zhao, Hongchang Wu, Na Wang, Xin Huang, Hongxun Hao","doi":"10.1007/s40843-024-3003-5","DOIUrl":null,"url":null,"abstract":"<p>Smart multi-stimuli responsive organic materials have become increasingly favored due to their advantages of high stability and easy regulation. In this study, a cyanostilbene derivative ((αZ)-2-chloro-α-[(4-methoxyphenyl)methylene]-5-pyridinehyde, TAR) was successfully synthesized, and its polymorphs (TAR-1 and TAR-2) exhibited multiple responsive behaviors under different stimulus conditions. TAR-1 is supposed to have excellent mechanical properties, while TAR-2 shows fascinating heterotropic photochromism (green-cyan-yellow) under different intensities of ultraviolet (UV) irradiation, which has never been reported in previous studies. Further investigation revealed that this was attributed to different degrees of [2+2] cycloaddition induced by UV light. In addition, both polymorphs could be protonated during Trifluoroacetic acid fuming and deprotonate automatically after fuming, accompanied by the significant variation in fluorescence. Finally, two scenarios were designed based on their unique stimuli-responsive properties, which proved their promising potential in fields of information security and anti-counterfeiting encryption.</p>","PeriodicalId":773,"journal":{"name":"Science China Materials","volume":null,"pages":null},"PeriodicalIF":6.8000,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Science China Materials","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1007/s40843-024-3003-5","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Smart multi-stimuli responsive organic materials have become increasingly favored due to their advantages of high stability and easy regulation. In this study, a cyanostilbene derivative ((αZ)-2-chloro-α-[(4-methoxyphenyl)methylene]-5-pyridinehyde, TAR) was successfully synthesized, and its polymorphs (TAR-1 and TAR-2) exhibited multiple responsive behaviors under different stimulus conditions. TAR-1 is supposed to have excellent mechanical properties, while TAR-2 shows fascinating heterotropic photochromism (green-cyan-yellow) under different intensities of ultraviolet (UV) irradiation, which has never been reported in previous studies. Further investigation revealed that this was attributed to different degrees of [2+2] cycloaddition induced by UV light. In addition, both polymorphs could be protonated during Trifluoroacetic acid fuming and deprotonate automatically after fuming, accompanied by the significant variation in fluorescence. Finally, two scenarios were designed based on their unique stimuli-responsive properties, which proved their promising potential in fields of information security and anti-counterfeiting encryption.
期刊介绍:
Science China Materials (SCM) is a globally peer-reviewed journal that covers all facets of materials science. It is supervised by the Chinese Academy of Sciences and co-sponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China. The journal is jointly published monthly in both printed and electronic forms by Science China Press and Springer. The aim of SCM is to encourage communication of high-quality, innovative research results at the cutting-edge interface of materials science with chemistry, physics, biology, and engineering. It focuses on breakthroughs from around the world and aims to become a world-leading academic journal for materials science.