N-Acylhydrazones have been described as responsive compounds to a wide variety of triggers that are able to induce reversible structural changes. These reversible constitutional, conformational or configurational changes caused by physical or chemical stimuli are useful tools in designing molecular switches. We report herein bis-N-acylhydrazones as new switchable-light emissive molecules triggered by light and/or solvents. The emissive properties could be explained by phototautomerisation (Excited State Intramolecular Proton Transfer) and by formation of aggregates (Aggregation-Induced Emission). We investigated the influence of structural particularities brought in by electron-donor or electron-withdrawing substituents as well as the requirement of several hydrazone bonds in the molecular structure for the generation of light.

中文翻译：

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N-酰基hydr体系的 构象诱导的发光转换†

N-酰基hydr已被描述为对多种引发剂的响应性化合物，能够引发可逆的结构变化。由物理或化学刺激引起的这些可逆的结构，构象或构型变化是设计分子开关的有用工具。我们在这里报告bis- N-酰基hydr作为由光和/或溶剂触发的新的可转换的发光分子。发射性质可以通过光互变异构化（激发态分子内质子转移）和聚集体的形成（聚集诱导的发射）来解释。我们研究了电子给体或吸电子取代基带来的结构特殊性的影响，以及分子结构中若干键对于产生光的需求。