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A "flexible" carborane-cored luminogen: variable emission behaviours in aggregates.

Jiaxin Li1, Jinkai Xu1, Linbo Yan2

  • 1State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, P. R. China. hyan1965@nju.edu.cn luchsh@nju.edu.cn.

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Researchers developed a flexible carborane-cored luminogen (NAPH) that shows tunable solid-state emissions. This single-component material exhibits multiple aggregation-induced behaviors and rarely seen opposite mechano-responsive luminescence in different polymorphs.

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Photophysics

Background:

  • Achieving tunable emissions in aggregated materials is difficult due to limited molecular conformations.
  • Developing single-component luminescent materials with diverse solid-state behaviors remains a challenge.

Purpose of the Study:

  • To design and synthesize a novel "flexible" luminogen with tunable photophysical properties in aggregates.
  • To investigate aggregation-induced emission, crystallization-induced emission, polymorph-dependent emission, and mechanochromic luminescence in a single-component material.
  • To explore the relationship between molecular conformation and variable emission behaviors in solid states.

Main Methods:

  • Synthesis of a carborane-cored compound (NAPH).
  • Photophysical characterization including emission spectra and luminescence studies.
  • Crystallization and polymorph analysis.
  • Theoretical calculations to understand molecular conformations.

Main Results:

  • The synthesized NAPH exhibits aggregation-induced emission, crystallization-induced emission, and polymorph-dependent emission.
  • Two distinct polymorphs showed opposite mechano-responsive luminescence, a rare phenomenon in single-component systems.
  • Variable molecular conformations, facilitated by the carborane core, were confirmed by theoretical and experimental studies.
  • These conformational variations in aggregates lead to diverse emission behaviors.

Conclusions:

  • The flexible carborane-cored luminogen (NAPH) enables multifunctional single-component solid-state luminescence.
  • Molecular flexibility is key to achieving tunable and multiple emission behaviors in aggregated materials.
  • This work offers a new strategy for designing advanced luminescent materials for various applications.