Li Dong, Feng Zefen, Han Yujie, Chen Chen, Zhang Qi-Wei, Tian Yang
Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200241, P. R. China.
Adv Sci (Weinh). 2022 Feb;9(6):e2104790. doi: 10.1002/advs.202104790. Epub 2022 Jan 6.
With the advancement of forgery and decryption methods, conventional static encryption technology is becoming more and more powerless, which strongly demands the development of multistate anticounterfeiting materials as well as advanced multidimensional encryption strategies and technologies. Here a new strategy to realize time-resolved encryption based on a self-assembled supramolecular ternary complex is presented, which exhibits tunable dynamic photochromic features caused by the reversible photodimerization/cleavage reactions of the guest chromophores inside the cavity of cucurbit[8]uril (CB[8]). This supramolecular system shows excellent photochromic properties, including extremely rapid response time, high conversion rate, and product-stereoselectivity, etc. More importantly, the kinetics of the photoreaction can be modulated by simply varying the host-guest ratios in aqueous or quasi-solid phase, providing the material with finely tunable time-dependent features, which cannot only be employed in data processing with more extended information, but also construct confidential materials by time-resolved multidimensional encryption and dynamic anticounterfeiting. The strategic design of kinetics-tunable supramolecular photochromic materials may provide valuable guidance for the development of more advanced materials for information security.
随着伪造和解密方法的不断进步，传统的静态加密技术越来越无能为力，这强烈要求开发多态防伪材料以及先进的多维加密策略和技术。本文提出了一种基于自组装超分子三元复合物实现时间分辨加密的新策略，该复合物表现出由葫芦[8]脲（CB[8]）腔内客体发色团的可逆光二聚化/裂解反应引起的可调动态光致变色特性。这种超分子体系具有优异的光致变色性能，包括极快的响应时间、高转化率和产物立体选择性等。更重要的是，通过简单地改变水相或准固相中的主客体比例，可以调节光反应的动力学，为材料提供精细可调的时间相关特性，这不仅可以用于处理包含更多扩展信息的数据，还可以通过时间分辨多维加密和动态防伪构建机密材料。动力学可调超分子光致变色材料的策略设计可能为开发更先进的信息安全材料提供有价值的指导。
