Photochromism and Fluorescence Switch of Furan-Containing Tetraarylethene Luminogens with Aggregation-Induced Emission for Photocontrolled Interface-Involved Applications
Photochromism and Fluorescence Switch of Furan-Containing Tetraarylethene Luminogens with Aggregation-Induced Emission for Photocontrolled Interface-Involved Applications
复制标题
含呋喃四芳基乙烯发光体的光致变色和荧光开关，具有聚集诱导发射，用于光控界面相关应用
DOI：
10.1021/acsami.0c12603
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发表时间：
2020-09-16
影响因子：
9.5
通讯作者：
Qian, Zhaosheng
中科院分区：
文献类型：
--
作者：
Guo, Sidan;Zhou, Shasha;Qian, Zhaosheng
设计适用于固体表面和界面的具有吸收和荧光双模输出的光控分子开关是极具挑战性的。本文报道了一组含呋喃的四芳基乙烯衍生物，它们具有独特的聚集诱导发光（AIE）的光物理行为和独特的光化学反应触发的光致变色行为。在AIE发光团中引入呋喃基或苯并呋喃基，使其具有显著的可逆光致变色性和固态荧光。这些分子的显色和脱色可以通过UV和可见光以可逆的方式分别照射来切换，并且光致变色变化伴随着固态荧光的开启和关闭。实验数据和理论分析表明，该化合物的可逆光致变色和荧光开关是由光控环化和环化反转反应引起的。引入的光活性单元的位置和共轭对光致变色的颜色和强度都有显着的影响，并且在固态下同时发生的光诱导荧光变化非常适合于涉及表面的应用。在滤纸上的光开关图案化和防伪纸的防伪中的双模信号的演示强烈地突出了这些具有聚集诱导发射特性的光致变色分子在各种实际应用中的独特优势。本工作提出了一种通过在AIEgen中引入光敏官能团来设计具有AIE活性的光致变色分子的一般策略，并在这些分子的双模信号和多功能应用中展示了无与伦比的优势。
It is extremely challenging to design photocontrolled molecular switches with absorption and fluorescence dual-mode outputs that are suited for a solid surface and interface. Herein, we report a group of furan-containing tetraarylethene derivatives with unique photophysical behavior of aggregation-induced emission (AIE) and distinct photochemical reaction-triggered photochromic behaviors by combining a photoactive furan or benzofuran group and an AIE-active triphenylethene molecule. The introduction of a furyl or benzofuryl group into the AIE luminogen endows the molecules with significant reversible photochromism and solid-state fluorescence. The coloration and decoloration of these molecules can be switched by respective irradiation of UV and visible light in a reversible way, and the photochromic changes are accompanied by a switch-on and switch-off of the solid-state fluorescence. It is revealed that the photocontrolled cyclization and cycloreversion reactions are responsible for the reversible photochromism and fluorescence switching based on experimental data and theoretical analysis. Both the position and conjugation of the introduced photoactive units have significant influence on the color and strength of the photochromism, and the simultaneous occurrence of photoinduced fluorescence change in the solid state is perfectly suited for surface-involved applications. The demonstrations of dual-mode signaling in photoswitchable patterning on a filter paper and anti-counterfeiting of an anti-falsification paper strongly highlight the unique advantage of these photochromic molecules with an aggregation-induced emission characteristic in various practical applications. This work proposes a general strategy to design photochromic molecules with AIE activity by introducing photoactive functionals into an AIEgen and demonstrates incomparable advantage in dual-mode signaling and multifunctional applications of these molecules.