Xie Yuqian, Zhao Xiaomei, Wang Hong, Tian Yong, Liu Chunyang, Wu Jingmei, Cui Jiaxi, Zhou Zhihua, Chen Jian, Chen Xudong
Key Laboratory of Theoretical Organic Chemistry and Functional Molecule of Ministry of Education, Hunan Provincial Key Laboratory of Controllable Preparation and Functional Application of Fine Polymers, Hunan Provincial Key Lab of Advanced Materials for New Energy Storage and Conversion, School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, Hunan, 411201, China.
School of Resource & Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, Hunan, 411201, China.
Angew Chem Int Ed Engl. 2025 Jan 10;64(2):e202414846. doi: 10.1002/anie.202414846. Epub 2024 Oct 17.
Time-resolved photofluorochromism constitutes a powerful approach to enhance information encryption security but remains challenging. Herein, we report a strategy of using hydrogen bonds to regulate the time for initiating photofluorochromism. In our strategy, copolymers containing negative photochromic spiropyran (NSP), naphthalimide, and multiple hydrogen-bonding (UPy) units are designed, which display photo-switchable fluorescence resonance energy transfer (FRET) process from naphthalimide donor to the NSP acceptor. Interestingly, the FRET is locked via the dynamic hydrogen-bonding interaction between ring-opened NSP and UPy moieties, resulting in time-dependent fluorescence. The change in fluorescence can be finely regulated via UPy fraction in the polymers. Besides the novel time-dependent fluorescence, the polymers also take advantage of visible-light triggerable, excellent photostability, photoreversibility, and processability. We demonstrate that these properties enable them many application opportunities such as fluorescent security labels and multilevel information encryption patterns.
时间分辨光致荧光变色是增强信息加密安全性的一种有效方法，但仍具有挑战性。在此，我们报告了一种利用氢键来调节引发光致荧光变色时间的策略。在我们的策略中，设计了含有负性光致变色螺吡喃（NSP）、萘二甲酰亚胺和多个氢键（UPy）单元的共聚物，其显示出从萘二甲酰亚胺供体到NSP受体的光开关荧光共振能量转移（FRET）过程。有趣的是，FRET通过开环NSP与UPy部分之间的动态氢键相互作用而被锁定，从而产生时间依赖性荧光。荧光的变化可以通过聚合物中UPy的比例进行精细调节。除了新颖的时间依赖性荧光外，这些聚合物还具有可见光触发、优异的光稳定性、光可逆性和可加工性等优点。我们证明，这些特性为它们带来了许多应用机会，如荧光安全标签和多级信息加密图案。
