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Flexible Organic Crystalline Fibers and Loops with Strong Second Harmonic Generation

  • 0School of Chemical Engineering and Technology, State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin 300072, China.
Journal of the American Chemical Society +

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March 20, 2025

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March 20, 2025

View abstract on PubMed

Summary

This summary is machine-generated.

Researchers developed a flexible organic crystal, (Z)-3-(2,3-dichloropyridin-4-yl)-2-(3,5-dimethylphenyl)acrylonitrile (DPA), that naturally forms curled shapes. These flexible crystals exhibit efficient second harmonic generation (SHG) for optical applications.

Area Of Science

  • Materials Science
  • Organic Chemistry
  • Optics

Background

  • Flexible organic crystals are smart materials with potential for optical applications.
  • Deformation of molecular crystals is typically induced externally.
  • Naturally occurring bent or curled crystals are rare.

Purpose Of The Study

  • To introduce a novel flexible organic crystalline fibrous material.
  • To investigate the self-curling crystallization behavior of this material.
  • To explore its potential for nonlinear optical applications.

Main Methods

  • Solution crystallization of (Z)-3-(2,3-dichloropyridin-4-yl)-2-(3,5-dimethylphenyl)acrylonitrile (DPA).
  • Mechanical and photochemical bending of straight crystals.
  • Characterization of second harmonic generation (SHG) properties of both straight and curled crystals.

Main Results

  • DPA crystallizes into both straight and naturally curled fibers, including closed loops.
  • Straight DPA crystals can be mechanically or photochemically deformed.
  • Both straight and curled DPA crystals exhibit efficient, polar second harmonic generation (SHG).

Conclusions

  • Naturally curled DPA crystals offer a scalable route to curved, SHG-active optical elements.
  • This material demonstrates unconventional properties for shape-conforming, nonlinear organic materials.
  • The findings open new avenues for flexible organic materials in optical technologies.

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