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Halogen Bonding: A New Platform for Achieving Multi-Stimuli-Responsive Persistent Phosphorescence.

Wenbo Dai1, Xiaowei Niu2, Xinghui Wu1

  • 1Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, China.

Angewandte Chemie (International Ed. in English)
|February 1, 2022
PubMed
Summary
This summary is machine-generated.

Introducing halogen bonding into organic room-temperature phosphorescence (RTP) materials enhances luminescence and enables multi-stimuli responsiveness. This breakthrough improves RTP material applications by controlling intermolecular interactions.

Keywords:
Halogen BondingHost-Guest SystemsMulti-Stimuli-Responsive LuminescenceRadioluminescenceRoom-Temperature PhosphorescenceWeak Intermolecular Interactions

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Photophysics

Background:

  • Organic room-temperature phosphorescence (RTP) materials face limitations due to monotonous luminescence.
  • Controlling intermolecular interactions in host-guest systems is key to enhancing phosphorescence.
  • Weak interactions offer sensitivity to external stimuli for responsive materials.

Purpose of the Study:

  • To introduce intermolecular halogen bonding (CN⋅⋅⋅Br) into a host-guest RTP system.
  • To enhance phosphorescence performance and achieve multi-stimuli responsiveness.
  • To explore weak intermolecular interactions for novel RTP material design.

Main Methods:

  • Incorporation of halogen bonding (CN⋅⋅⋅Br) into host-guest RTP systems.
  • Investigation of the effect of halogen bonding on intersystem crossing and triplet exciton stabilization.
  • Evaluation of the sensitivity of halogen bonding to external stimuli (heat, mechanical force, X-rays).

Main Results:

  • Halogen bonding promoted intersystem crossing and stabilized triplet excitons, leading to strong phosphorescence.
  • The weak halogen bonding interaction enabled facile quenching of triplet excitons by external stimuli.
  • Colorimetric multi-stimuli responsive behaviors were successfully realized in the RTP materials.

Conclusions:

  • Intermolecular halogen bonding is an effective strategy to enhance and regulate RTP performance.
  • This approach provides a new platform for designing responsive RTP materials based on weak intermolecular interactions.
  • The developed method enriches the luminescence functionality of RTP materials for broader applications.