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Straight, bendable and bent organic crystals.

Khushboo Yadava1, Xian Qin, Xiaogang Liu

  • 1Department of Chemistry, National University of Singapore, Singapore 117543, Singapore. chmjjv@nus.edu.sg.

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|November 23, 2019
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Summary
This summary is machine-generated.

trans-4-Phenylazobenzoic acid (pab) exhibits diverse crystal morphologies. UV-irradiation induces cis-pab formation, leading to bent crystals, offering insights into molecular structure and material properties.

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Area of Science:

  • Crystallography
  • Photochemistry
  • Materials Science

Background:

  • Crystallization is crucial for material properties.
  • Photochemical transformations can alter molecular structure and crystal behavior.
  • Understanding crystal morphology is key to controlling material characteristics.

Purpose of the Study:

  • To investigate the crystallization of trans-4-Phenylazobenzoic acid (pab).
  • To explore the effect of UV-irradiation on pab crystal morphology.
  • To elucidate the structural basis for observed crystal bending.

Main Methods:

  • Recrystallization of trans-4-Phenylazobenzoic acid.
  • UV-irradiation of pab in solution.
  • Morphological analysis of resulting crystals.
  • Analysis of cis-form content in bent crystals.

Main Results:

  • Pab crystallized into three distinct morphologies: rod-like, thin platy, and bent crystals.
  • Bent crystals were obtained after UV-irradiation and recrystallization.
  • The presence of a small amount of the cis-form of pab was identified as the cause of crystal bending.
  • The elastic bending of thin platy crystals was explained by crystal packing.

Conclusions:

  • UV-irradiation induces a photoisomerization to the cis-form, influencing pab crystallization.
  • Crystal morphology and bending are directly linked to molecular structure and isomerization.
  • Crystal packing plays a role in the mechanical properties of pab crystals.