We report a purely organic recyclable mechanoluminescent luminogen (tPE-5-MeTh) with the combination of an AIEgen and a thiophene group as the self-assembly unit. As a result of the different self-assembly effects, two crystalline polymorphs were cultured from different solvents, which possess totally different packing modes and various inter/intramolecular interactions with opposite ML properties. Excitingly, the molecular packing status of tPE-5-MeTh could be adjusted through simple thermal-treatment, offering recoverability and controllability of its ML activity. These results provide a new avenue for rational molecular design, convenience of potential applications and deep understanding of the inherent mechanism.

中文翻译：

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可回收的机械发光发光剂：不同的多晶型物，噻吩部分的不同自组装效应以及通过简单的热处理即可回收的分子堆积†

我们报告了纯有机可循环机械发光发光剂（tPE-5-MeTh），其中AIEgen和噻吩基团为自组装单元。由于不同的自组装效应，从不同的溶剂中培养出两种结晶多晶型物，它们具有完全不同的堆积模式以及具有相反的ML特性的各种分子间/分子间相互作用。令人兴奋的是，可以通过简单的热处理来调节tPE-5-MeTh的分子堆积状态，从而提供其ML活性的可恢复性和可控性。这些结果为合理的分子设计，便利的潜在应用和对内在机理的深入理解提供了新途径。