Discovery of Functional Luminescence Properties Based on Flexible and Bendable Boron-Fused Azomethine/Azobenzene Complexes with O,N,O-Type Tridentate Ligands,The Chemical Record

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Discovery of Functional Luminescence Properties Based on Flexible and Bendable Boron-Fused Azomethine/Azobenzene Complexes with O,N,O-Type Tridentate Ligands
The Chemical Record ( IF 7.0 ) Pub Date : 2021-01-04 , DOI: 10.1002/tcr.202000156
Masayuki Gon ₁ , Kazuo Tanaka ₁ , Yoshiki Chujo ₁

Affiliation

Azomethine (C=N) and azo (N=N) scaffolds are a part of structural units in poly(p-phenylene azomethine) (PAM) and poly(p-phenylene azo) (PAZ), respectively. Poly(p-phenylene vinylene) (PPV) is known to be one of luminescent π-conjugated polymers, meanwhile PAM and PAZ, which are the aza-substituted PPV analogues, are regarded as weak or no emissive materials. However, by the boron complexation, intense emission can be induced. Furthermore, environment-sensitivity and stimuli-responsivity were also observed. In this review, we demonstrate unique and versatile luminescent properties based on “flexible and bendable” π-conjugated systems composed of the boron-fused azomethine and azobenzene complexes (BAm and BAz) with the O,N,O-type tridentate ligands. The “flexible and bendable” luminophores showed intriguing optical behaviors, such as thermosalient effect, aggregation-induced emission (AIE) and crystallized-induced emission (CIE). Moreover, highly efficient emissions both in solution and film states were observed from the polymers. We illustrate the results and mechanisms on these luminescent properties from the series of our recent studies with BAm and BAz complexes and polymers.

中文翻译：

基于具有 O,N,O 型三齿配体的柔性和可弯曲硼稠合的偶氮甲碱/偶氮苯配合物的功能发光特性的发现

偶氮甲碱 (C=N) 和偶氮 (N=N) 支架分别是聚（对亚苯基偶氮甲碱）（PAM）和聚（对亚苯基偶氮基）（PAZ）结构单元的一部分。聚( p-亚苯基亚乙烯基) (PPV) 是一种发光的 π 共轭聚合物，同时作为氮杂取代的 PPV 类似物的 PAM 和 PAZ 被认为是弱发光材料或无发光材料。然而，通过硼络合，可以诱导强烈的发射。此外，还观察到环境敏感性和刺激响应性。在这篇综述中，我们展示了基于由硼稠合的偶氮甲碱和偶氮苯配合物（BAm 和 BAz）与 O、N、O 型三齿配体组成的“柔性和可弯曲”π 共轭系统的独特且通用的发光特性。“灵活和可弯曲”的发光体显示出有趣的光学行为，如热显着效应、聚集诱导发射 (AIE) 和结晶诱导发射 (CIE)。而且，从聚合物中观察到在溶液和薄膜状态下的高效排放。我们从我们最近对 BAm 和 Baz 配合物和聚合物的一系列研究中说明了这些发光特性的结果和机制。

更新日期：2021-01-04

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