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Light-Responsive Hexagonal Assemblies of Triangular Azo Dyes.

Mina Han1, Khin Moe1

  • 1Department of Chemistry Education, Kongju National University, Gongju 32588, Korea.

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|July 27, 2022
PubMed
Summary

Researchers designed triangular azo dyes that form stable hexagonal structures with unique light-induced transformations. One compound with tert-butyl groups exhibits significant molecular switching and aggregation-induced emission enhancement.

Keywords:
fluorescence characteristicslight responsemolecular assemblysize-tunable hexagonal structurestriangular azo dye

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Supramolecular Chemistry

Background:

  • Rational design of molecular building blocks is crucial for stimuli-responsive organic architectures.
  • Understanding molecular assembly influences material properties and functions.

Purpose of the Study:

  • Investigate light-induced conformational changes and molecular assembly of triangular azo dyes.
  • Characterize the structure-property relationships of functionalized azo dyes.

Main Methods:

  • Synthesis and experimental characterization of four triangular azo dyes with varying functional groups.
  • Spectroscopic (absorption, fluorescence) and microscopic (electron microscopy) analyses.
  • Evaluation of light-induced molecular switching and aggregation behavior.

Main Results:

  • Azo dye 1 with tert-butyl groups showed ~35% light-induced molecular switching and formed stable hexagonal assemblies with aggregation-induced emission enhancement (AIEE).
  • Assembly size ranged from nanometer rods to micrometer sticks, concentration-dependent.
  • Other dyes (bromo, TPA substituted) showed no photoisomerization and formed flexible fibers.
  • UV light induced a hexagonal-to-amorphous structural transition in fluorescent nanorods, altering microscopic and fluorescence properties.

Conclusions:

  • Sterically hindered tert-butyl groups promote light-induced switching and stable hexagonal self-assembly with AIEE.
  • Concentration controls the size of hexagonal nanostructures.
  • Light stimuli can reversibly alter the supramolecular structure and optical properties of these azo dyes.