A Photo- and Thermo-Driven Azoarene-Based Circularly Polarized Luminescence Molecular Switch in a Liquid Crystal Host

IF 16.1 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Angewandte Chemie International Edition Pub Date : 2023-08-30 DOI:10.1002/anie.202311486
Wenxin Kang, Yuqi Tang, Xianyu Meng, Siyang Lin, Xinfang Zhang, Prof. Jinbao Guo, Prof. Quan Li
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引用次数: 1

Abstract

The development of chiral optical active materials with switchable circularly polarized luminescence (CPL) signals remains a challenge. Here an azoarene-based circularly polarized luminescence molecular switch, (S, R, S)-switch 1 and (R, R, R)-switch 2, are designed and prepared with an (R)-binaphthyl azo group as a chiral photosensitive moiety and two (S)- or (R)-binaphthyl fluorescent molecules with opposite or the same handedness as chiral fluorescent moieties. Both switches exhibit reversible trans/cis isomerization when irradiated by 365 nm UV light and 520 nm green light in solvent and liquid crystal (LC) media. In contrast with the control (R, R, R)-switch 2, when switch 1 is doped into nematic LCs, polarization inversion and switching-off of the CPL signals are achieved in the resultant helical superstructure upon irradiation with 365 nm UV and 520 nm green light, respectively. Meanwhile, the fluorescence intensity of the system is basically unchanged during this switching process. In particular, these variations of the CPL signals could be recovered after heating, realizing the true sense of CPL reversible switching. Taking advantage of the unique CPL switching, the proof-of-concept for “a dual-optical information encryption system” based on the above CPL active material is demonstrated.

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液晶基质中光热驱动偶氮芳烃基圆偏振发光分子开关。
具有可切换圆偏振发光(CPL)信号的手性光活性材料的开发仍然是一个挑战。本文设计并制备了基于偶氮芳烃的圆极化发光分子开关(S, R, S)-开关1和(R, R, R)-开关2,其中(R)-联萘偶氮基团作为手性光敏基团,两个(S)-或(R)-联萘荧光分子具有与手性荧光基团相反或相同的手性。在溶剂和液晶(LC)介质中,当365 nm紫外光和520 nm绿光照射时,两种开关都表现出可逆的反式/顺式异构化。与控制(R, R, R)开关2相比,当开关1掺杂到向列型lc中,在365 nm紫外光和520 nm绿光照射下,CPL信号在合成的螺旋上层结构中分别实现了极化反转和关闭。同时,在这个切换过程中,系统的荧光强度基本不变。特别是,CPL信号的这些变化可以在加热后恢复,实现了真正意义上的CPL可逆开关。利用独特的CPL开关特性,展示了基于上述CPL有源材料的“双光信息加密系统”的概念验证。
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来源期刊
CiteScore
26.60
自引率
6.60%
发文量
3549
审稿时长
1.5 months
期刊介绍: Angewandte Chemie, a journal of the German Chemical Society (GDCh), maintains a leading position among scholarly journals in general chemistry with an impressive Impact Factor of 16.6 (2022 Journal Citation Reports, Clarivate, 2023). Published weekly in a reader-friendly format, it features new articles almost every day. Established in 1887, Angewandte Chemie is a prominent chemistry journal, offering a dynamic blend of Review-type articles, Highlights, Communications, and Research Articles on a weekly basis, making it unique in the field.
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