The rational design of stimuli-responsive materials requires a deep understanding of the structure–activity relationship. Herein, we proposed an intramolecular conformation-locking strategy─incorporating flexible tetraphenylethylene (TPE) luminogens into the rigid scaffold of a molecular cage─to produce a molecular photoswitch with dual outputs of luminescence and photochromism in solution and in the solid states at once. The molecular cage scaffold, which restricts the intramolecular rotations of the TPE moiety, not only helps to preserve the luminescence of TPE in a dilute solution but facilitates the reversible photochromism on account of the intramolecular cyclization/cycloreversion reactions. Furthermore, we demonstrate assorted applications of this multiresponsive molecular cage, e.g., photo-switchable patterning, anticounterfeiting, and selective vapochromism sensing.

中文翻译：

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在溶液和固态均具有光致变色和发光双输出的分子笼

刺激响应材料的合理设计需要对构效关系有深刻的理解。在本文中，我们提出了一种分子内构象锁定策略——将柔性四苯乙烯 (TPE) 发光体结合到分子笼的刚性支架中——以产生在溶液和固态同时具有发光和光致变色双重输出的分子光开关。限制 TPE 部分分子内旋转的分子笼支架不仅有助于在稀溶液中保持 TPE 的发光，而且由于分子内环化/环化反应而促进可逆光致变色。此外，我们展示了这种多响应分子笼的各种应用，例如光切换图案、防伪、