Multifunctional Fluorescent Materials with Reversible Mechanochromism and Distinct Photochromism,Advanced Optical Materials

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Multifunctional Fluorescent Materials with Reversible Mechanochromism and Distinct Photochromism
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2022-12-19 , DOI: 10.1002/adom.202202259
Weihua Luo ₁ , Yiyuan Tang ₁ , Xin Zhang ₁ , Zhen Wu ₁ , Guojie Wang ₁

Affiliation

It is extremely significant and desirable to integrate the fascinating mechanochromism and photochromism in one simple molecule. Herein, two intriguing cyanostilbene-containing triphenylamine (TPA)/tetraphenylethylene (TPE) derivatives (Z-TPA-MB and Z-TPE-MB) are elaborately designed, which not only display excellent aggregation-induced emission (AIE) properties with high solid-state fluorescence quantum yields (60.9% and 63.8%) but also exhibit reversible and high contrast mechanochromism and distinct photochromism. The powders of Z-TPA-MB and Z-TPE-MB both exhibit large red-shift under mechanical stimulation based on the highly twisted conformation and the resulting loose packing mode, accompanied by significant changes in apparent and fluorescent colors. Meanwhile, their solid-state fluorescence can be reversibly switched between crystalline and amorphous structures through alternating grinding and solvent fuming, exhibiting good fatigue resistance. In addition, the molecules also exhibit distinct dual-mode photochromic behaviors owing to the presence of cyanostilbene moieties: under 420/365 nm light irradiation, the fluorescence of which decreases in solution owing to the photo-isomerization, while decreases and blue-shifts in the aggregated state owing to the photodimerization reactions. The reversible, tractable, and high-contrast mechanochromism and distinct photochromism of the cyanostilbene-containing molecules endow them with excellent application prospects in the field of rewritable papers and photo-patterning.

中文翻译：

具有可逆机械变色和独特光致变色的多功能荧光材料

将迷人的机械致色和光致变色整合到一个简单的分子中是极其重要和可取的。在此，精心设计了两种有趣的含氰基二苯乙烯的三苯胺（TPA）/四苯乙烯（TPE）衍生物（Z -TPA-MB 和Z -TPE-MB），它们不仅具有优异的聚集诱导发光（AIE）性能，而且具有高固含量态荧光量子产率（60.9% 和 63.8%），但也表现出可逆和高对比度的机械变色和明显的光致变色。Z -TPA-MB和Z的粉末-TPE-MB 基于高度扭曲的构象和由此产生的松散堆积模式，在机械刺激下均表现出较大的红移，并伴有表观颜色和荧光颜色的显着变化。同时，它们的固态荧光可以通过交替研磨和溶剂发烟在结晶和非晶结构之间可逆地切换，表现出良好的抗疲劳性。此外，由于氰芪部分的存在，分子还表现出明显的双模式光致变色行为：在 420/365 nm 光照射下，由于光异构化，其荧光在溶液中减弱，而在溶液中荧光减弱并发生蓝移。由于光二聚反应而形成的聚集状态。可逆的，易处理的，

更新日期：2022-12-19

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