Design and synthesis of molecular assemblies which exhibit aggregation-induced emission (AIE) have attracted persistent attention in recent years. However, studies on the impact of the substitution position in isostructural molecules to regulate aggregation-induced emission (AIE) or convert aggregation-caused quenching (ACQ) to AIE have not been reported to date. In the present study, aggregation properties of two isostructural fluorophores viz. (E)-4-(2-(anthracen-9-yl)vinyl)benzonitrile (p-AnCN) and (E)-3-(2-(anthracen-9-yl)vinyl)benzonitrile (m-AnCN), with different substitution positions have been evaluated. It was observed that m-AnCN exhibits an ACQ behavior, whereas, p-AnCN exhibits enhanced emission upon aggregation. Upon aggregation, c.a. 1.4-fold decrease in luminescence quantum yield has been observed for m-AnCN, whereas, c.a. 11-fold enhancement in luminescence quantum yield has been achieved for p-AnCN. Results from the study indicate that absence of interplay between the excited states from a dark Intramolecular Charge Transfer (ICT) state to Locally Excited state (LE) in m-AnCN is the primary reason behind the observed difference in the emission properties of the aggregates. Thus, modulation of ACQ-AIE properties has been achieved using isostructural organic fluorophores, which in turn can be used as a versatile strategy to achieve AIE-luminophores. Further, the AIE active p-AnCN aggregates have been utilized to generate three-component white light emission with CIE coordinates of (0.33, 0.33).

表现出聚集诱导发射（AIE）的分子组件的设计和合成近年来引起了持续的关注。但是，迄今为止，尚未有关于同结构分子中的取代位置对调节聚集诱导发射（AIE）或将聚集引起的猝灭（ACQ）转换为AIE影响的研究。在本研究中，两个同构荧光聚集性质即。（E）-4-（2-（蒽-9-乙烯基）乙烯基）苄腈（p -AnCN）和（E）-3-（2-（蒽-9-乙烯基）乙烯基）苄腈（m -AnCN），评估了具有不同取代位置的化合物。观察到，m- AnCN表现出ACQ行为，而p-AnCN在聚集时表现出增强的发射。聚集后，对于m -AnCN观察到发光量子产率降低约1.4倍，而对于p -AnCN观察到发光量子产率提高约11倍。研究结果表明，在m- AnCN中，从暗分子内电荷转移（ICT）态到局部激发态（LE）的激发态之间没有相互作用，这是观察到聚集体发射特性差异的主要原因。因此，已经使用同结构有机荧光团实现了对ACQ-AIE性质的调节，而该荧光团又可以用作实现AIE发光团的通用策略。此外，AIE主动p-AnCN聚集体已用于生成三组分白光发射，CIE坐标为（0.33，0.33）。