Aggregation-Induced Emission: From Small Molecules to Polymers—Historical Background, Mechanisms and Photophysics

IF 7.1 2区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Topics in Current Chemistry Pub Date : 2021-03-16 DOI:10.1007/s41061-021-00327-9
Ana Clara B. Rodrigues, J. Sérgio Seixas de Melo
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引用次数: 21

Abstract

The enhancement of photoluminescence through formation of molecular aggregates in organic oligomers and conjugated organic polymers is reviewed. A historical contextualization of aggregation-induced emission (AIE) phenomena is presented. This includes the loose bolt or free rotor effect and J-aggregation phenomena, and discusses their characteristic features, including structures and mechanisms. The basis of both effects is examined in key molecules, with a particular emphasis on the AIE effect occurring in conjugated organic polymers with a polythiophene (PT) skeleton with triphenylethylene (TPE) units. Rigidification of the excited state structure is one of the defining conditions required to obtain AIE, and thus, by changing from a flexible ground state to rigid (quinoidal-like) structures, oligo and PTs are among the most promising emerging molecules alongside?with the more extensively used TPE derivatives. Molecular structures moving away from the domination of aggregation-caused quenching to AIE are presented. Future perspectives for the rational design of AIEgen structures are discussed.

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聚集诱导发射:从小分子到聚合物——历史背景、机制和光物理
综述了通过在有机低聚物和共轭有机聚合物中形成分子聚集体来增强光致发光的研究进展。介绍了聚集诱导发射(AIE)现象的历史背景。这包括螺栓松动或自由转子效应和j聚集现象,并讨论了它们的特征,包括结构和机理。这两种效应的基础在关键分子中进行了检查,特别强调AIE效应发生在具有三苯基乙烯(TPE)单元的聚噻吩(PT)骨架的共轭有机聚合物中。激发态结构的刚性是获得AIE所需的定义条件之一,因此,通过从柔性基态转变为刚性(类醌)结构,oligo和PTs是最有希望的新兴分子之一?与更广泛使用的TPE衍生物。分子结构从聚集引起的淬火转向AIE。最后讨论了未来AIEgen结构合理设计的前景。
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来源期刊
Topics in Current Chemistry
Topics in Current Chemistry Chemistry-General Chemistry
CiteScore
13.70
自引率
1.20%
发文量
48
期刊介绍: Topics in Current Chemistry is a journal that presents critical reviews of present and future trends in modern chemical research. It covers all areas of chemical science, including interactions with related disciplines like biology, medicine, physics, and materials science. The articles in this journal are organized into thematic collections, offering a comprehensive perspective on emerging research to non-specialist readers in academia or industry. Each review article focuses on one aspect of the topic and provides a critical survey, placing it in the context of the collection. Selected examples highlight significant developments from the past 5 to 10 years. Instead of providing an exhaustive summary or extensive data, the articles concentrate on methodological thinking. This approach allows non-specialist readers to understand the information fully and presents the potential prospects for future developments.
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