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高等学校化学研究 ›› 2021, Vol. 37 ›› Issue (1): 157-161.doi: 10.1007/s40242-021-0397-y

• Articles • 上一篇    下一篇

State-crossing from a Locally Excited to an Electron Transfer State(SLEET) Model Rationalizing the Aggregation-induced Emission Mechanism of (Bi)piperidylanthracenes

CHI Weijie, WANG Chao, LIU Xiaogang   

  1. Fluorescence Research Group, Singapore University of Technology and Design, 487372, Singapore
  • 收稿日期:2020-11-29 修回日期:2020-12-31 出版日期:2021-02-01 发布日期:2021-01-04
  • 通讯作者: LIU Xiaogang E-mail:Xiaogang_liu@sutd.edu.sg
  • 基金资助:
    This work was supported by A*STAR under Its Advanced Manufacturing and Engineering Program of Singapore(No.A2083c0051).

State-crossing from a Locally Excited to an Electron Transfer State(SLEET) Model Rationalizing the Aggregation-induced Emission Mechanism of (Bi)piperidylanthracenes

CHI Weijie, WANG Chao, LIU Xiaogang   

  1. Fluorescence Research Group, Singapore University of Technology and Design, 487372, Singapore
  • Received:2020-11-29 Revised:2020-12-31 Online:2021-02-01 Published:2021-01-04
  • Contact: LIU Xiaogang E-mail:Xiaogang_liu@sutd.edu.sg
  • Supported by:
    This work was supported by A*STAR under Its Advanced Manufacturing and Engineering Program of Singapore(No.A2083c0051).

摘要: Luminogens with aggregation-induced emission(AIE) characte-ristics(or AIEgens) have been widely used in various applications due to their excellent luminescent properties in molecular aggregates and the solid state. A deep understanding of the AIE mechanism is critical for the rational development of AIEgens. In this work, the "state-crossing from a locally excited to an electron transfer state"(SLEET) model is employed to rationalize the AIE phenomenon of two (bi)piperidylanthracenes. According to the SLEET model, an electron transfer(ET) state is formed along with the rotation of the piperidyl group in the excited state of (bi)piperidylan-thracene monomers, leading to fluorescence quenching. In contrast, a bright state exists in the crystal and molecular aggregates of these compounds, as the intermolecular interactions restrict the formation of the dark ET state. This mechanistic understanding could inspire the deployment of the SLEET model in the rational designs of various functional AIEgens.

关键词: Aggregation-induced emission, State-crossing from a locally excited to an electron transfer state(SLEET) model, Organic dye, Computational chemistry

Abstract: Luminogens with aggregation-induced emission(AIE) characte-ristics(or AIEgens) have been widely used in various applications due to their excellent luminescent properties in molecular aggregates and the solid state. A deep understanding of the AIE mechanism is critical for the rational development of AIEgens. In this work, the "state-crossing from a locally excited to an electron transfer state"(SLEET) model is employed to rationalize the AIE phenomenon of two (bi)piperidylanthracenes. According to the SLEET model, an electron transfer(ET) state is formed along with the rotation of the piperidyl group in the excited state of (bi)piperidylan-thracene monomers, leading to fluorescence quenching. In contrast, a bright state exists in the crystal and molecular aggregates of these compounds, as the intermolecular interactions restrict the formation of the dark ET state. This mechanistic understanding could inspire the deployment of the SLEET model in the rational designs of various functional AIEgens.

Key words: Aggregation-induced emission, State-crossing from a locally excited to an electron transfer state(SLEET) model, Organic dye, Computational chemistry