Synthesis, Self-assembly and Photophysical Properties of A Three-state Highly Emissive Mesogen

ZHENG Jun-feng; GONG Jia-xin; CHENG Xiao-fan; GE Yun-chong; XU Peng

doi:10.37188/CJL.20220047

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Synthesis, Self-assembly and Photophysical Properties of A Three-state Highly Emissive Mesogen

Synthesis and Properties of Materials | 更新时间：2022-10-19

- Synthesis, Self-assembly and Photophysical Properties of A Three-state Highly Emissive Mesogen
  增强出版
- Chinese Journal of Luminescence Vol. 43, Issue 6, Pages: 869-878(2022)
- 作者机构：
  
  南京林业大学化学工程学院应用化学系，江苏南京　210037
- 作者简介：
- 基金信息：
- DOI：10.37188/CJL.20220047
  CLC： O753⁺.2
- Published：05 June 2022，
  
  Received：15 February 2022，
  
  Revised：02 March 2022，
- 稿件说明：
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郑军峰,宫佳鑫,程晓帆等.一种三态发光的液晶基元合成、自组装及光物理性质[J].发光学报,2022,43(06):869-878.

ZHENG Jun-feng,GONG Jia-xin,CHENG Xiao-fan,et al.Synthesis, Self-assembly and Photophysical Properties of A Three-state Highly Emissive Mesogen[J].Chinese Journal of Luminescence,2022,43(06):869-878.
郑军峰,宫佳鑫,程晓帆等.一种三态发光的液晶基元合成、自组装及光物理性质[J].发光学报,2022,43(06):869-878. DOI： 10.37188/CJL.20220047.

ZHENG Jun-feng,GONG Jia-xin,CHENG Xiao-fan,et al.Synthesis, Self-assembly and Photophysical Properties of A Three-state Highly Emissive Mesogen[J].Chinese Journal of Luminescence,2022,43(06):869-878. DOI： 10.37188/CJL.20220047.

摘要

聚集导致猝灭（ACQ）分子在单分子态（如稀溶液）高效发光，而聚集诱导发光（AIE）分子在聚集态（如固态）高效发光。这一单态发光的特性严重制约着发光材料的应用。本工作中，我们合成了一种三态（溶液、凝胶、液晶）发光的phasmid液晶基元（

PHAgen-12

），并考察了其自组装性质与光物理性质。

PHAgen-12

的两端为一代树枝单元，中间为“二苯基氰基乙烯（AIE）+二苯基丁二炔（ACQ）+二苯基氰基乙烯（AIE）”的刚性核，具有D-A-π-A-D的特征。该分子在普通溶剂（如THF、DCM）中可以溶解；在选择性溶剂烷烃中形成柱状胶束，并可凝胶化；在固态形成六方柱状液晶相，单分子层厚度（～0.44 nm）的单胞内含有～4个分子。

PHAgen-12

在单分子态表现出ACQ分子的性质，在氯仿中荧光量子产率（QY）为～90.3%；在聚集态表现出AIE性质，

PHAgen-12

/十二烷凝胶体系（质量百分比为30%）的QY为58.5%，本体液晶态的QY为85.5%。

Abstract

Aggregation-caused quenching（ACQ） and aggregation-induced emission（AIE） molecules are highly emissive only in single molecular and aggregated state， respectively. This single-state emissive character highly hampers their applications. In this work， we synthesized a three-state（solution， gel and liquid crystal） highly emissive phasmid mesogen（

PHAgen-12

） and studied its self-assembly and photophysical properties.

PHAgen-12

consists of a long rod-like part ended by two Percec-type dendrons. The rod-like core is “cyanostilbene + diphenyl-diacetylene+cyanostilbene”， featuring a D-A-π-A-D type emitter.

PHAgen-12

can well dissolve in common solvents such as THF and DCM， form cylindrical micelle and further gel in selective solvents（alkanes）， and develop into a hexagonal columnar liquid crystalline phase in bulk state， with four molecules in each monomolecule-thick（～0.44 nm） hexagonal unit cell. In dilute solution， it behaves like a ACQ molecule with a quantum yield（QY） up to 90.3 % in CHCl

. It renders a strong AIE character in condensed states， with a QY of 58.5% in

PHAgen-12/

dodecane gel system（30%（wt）） and a QY of 85.5% in bulk liquid crystalline state

关键词

多态发光液晶凝胶聚集诱导发光（AIE）聚集导致荧光猝灭（ACQ）

Keywords

multi-state emissiveliquid crystalgelaggregation-induced emission（AIE）aggregation-caused quenching（ACQ）

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郑军峰(1983-)，男，河南平舆人，博士，讲师，2012年于北京大学获得博士学位，主要从事高分子合成、自组装与功能的研究。. doi: 10.1002/anie.201507031http://dx.doi.org/10.1002/anie.201507031

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