Aggregation-mediated photo-responsive luminescence of cyanostilbene based cruciform AIEgens
Aggregation-mediated photo-responsive luminescence of cyanostilbene based cruciform AIEgens
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基于氰基芪的十字形 AIEgens 的聚集介导光响应发光
DOI：
10.1039/d0tc05131d
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发表时间：
2021-01
期刊：
影响因子：
--
通讯作者：
Liu Yi
中科院分区：
文献类型：
--
作者：
Zhang Zhibo;Liu Xiaoqing;Feng Yang;Yu Zhen-Qiang;Wang Lei;Ren Xiang-Kui;Liu Yi
光致变色材料由于其独特的光响应特性和作为智能材料的应用前景而受到人们的极大关注。本文合成了两种具有十字形拓扑结构的基于氰基芪的AIEgens，并对其进行了表征。在加入水后，由于聚集体的形成，两种荧光团在THF/水混合物中表现出增强的发射。在溶液中，这些AIEgens的发射可以在用365 nm UV光照射后随着蓝移吸收而逐渐衰减，并且在暴露于254 nm UV光时恢复。这一现象归因于氰基芪单元的可逆E/Z异构化，并通过NMR光谱证实。相比之下，对于纳米聚集体或固态的样品，可以通过[2+2]环加成有效地猝灭发射，这破坏了发色团的共轭骨架。光致变色发光也可以通过将荧光团分散在PMMA基质中并通过调节它们在聚合物膜中的浓度来调制来实现。同时，十字形AIEgens在固态下也表现出明显的机械致变色发光。
Photochromic materials have received tremendous attention owing to their unique photoresponsive behaviour and promising applications as smart materials. Herein, two cyanostilbene based AIEgens with a cruciform topology were synthesized and well characterized. Upon the addition of water, both fluorophores exhibited enhanced emission in the THF/water mixture owing to aggregate formation. In solution, the emission of these AIEgens can be gradually attenuated with blue-shifted absorption after irradiating with 365 nm UV light and recovered on exposure to 254 nm UV light. This phenomenon was attributed to the reversible E/Z isomerization of the cyanostilbene units and confirmed by NMR spectroscopy. By contrast, for the sample in the nano-aggregate or solid state, the emission can be efficiently quenched via [2+2] cycloaddition which had disrupted the conjugation backbone of the chromophore. Photochromic luminescence can also be realized by dispersing the fluorophores in a PMMA matrix and modulated by tuning their concentration in the polymer film. Meanwhile, the cruciform AIEgens also exhibited obvious mechanochromic luminescence in the solid state.
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