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Multicolor fluorescence switching material induced by force and acid.

Xiaona Zhang1, Jue Wei1, Hongyang Qi1

  • 1College of Physics, Jilin University, Changchun 130012, PR China.

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|November 26, 2021
PubMed
Summary

A novel D-A-D chromophore, TBQM, exhibits reversible multicolor fluorescence switching. This material shows potential for advanced fluorescent anti-counterfeiting ink applications.

Keywords:
Acid/base responseAcylhydrazoneMechanofluorochromismMulticolor fluorescence switchingTriphenylamine

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Photophysics

Background:

  • Development of novel chromophores with tunable optical properties is crucial for advanced materials.
  • Investigating stimuli-responsive fluorescence is key for applications like sensors and anti-counterfeiting.
  • Triphenylamine, acylhydrazone, and dimethylamino moieties are known building blocks for functional organic materials.

Purpose of the Study:

  • To synthesize and characterize a novel D-A-D chromophore, TBQM.
  • To investigate the solution and aggregated state emission properties of TBQM.
  • To explore the reversible multicolor fluorescence switching behavior of TBQM under external stimuli.

Main Methods:

  • Synthesis of the D-A-D chromophore TBQM.
  • Spectroscopic analysis of fluorescence properties in various solutions.
  • Investigation of fluorescence changes upon mechanical grinding and acid/base fumigation.
  • Evaluation of TBQM as a fluorescent anti-counterfeiting ink.

Main Results:

  • TBQM displayed significant solvatochromism in different solvents.
  • Reversible multicolor fluorescence switching was achieved via mechanical force (grinding) and acid treatment.
  • Grinding induced a color change from blue to blue-green, recoverable with dichloromethane.
  • Protonation with trifluoroacetic acid (TFA) resulted in a color shift from blue to yellow-green, with fluorescence quenching, which was reversible.
  • TBQM demonstrated potential as an advanced fluorescent anti-counterfeiting ink.

Conclusions:

  • The synthesized TBQM chromophore exhibits unique solvatochromic and stimuli-responsive fluorescence properties.
  • TBQM shows reversible multicolor fluorescence switching triggered by mechanical stress and acid/base interactions.
  • These properties make TBQM a promising candidate for advanced fluorescent anti-counterfeiting ink applications.