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  4. Packing-Dependent Mechanical Properties of Schiff Base Crystals
 
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Packing-Dependent Mechanical Properties of Schiff Base Crystals

Journal
Crystal Growth and Design
ISSN
1528-7483
Date Issued
2022
Author(s)
Li, Liang 
Physics, Mathematics, Computer science 
Lan, Linfeng
Di, Qi
Liu, Bin
Xu, Yu-xin
Naumov, Panče
Zhang, Hongyu
DOI
10.1021/acs.cgd.2c00225
Abstract
Flexible luminescent crystals endowed with mechanical compliance are emerging as materials that could be the foundation of future lightweight single-crystal flexible optoelectronics. Multiple mechanical responses (for example, elastic and plastic deformation) are rarely observed with the same material among the reported examples of such materials. Here, we report a Schiff base, (Z)-3-(4-ethoxyphenyl)-2-(4-(((E)-2-hydroxy-5-methoxybenzylidene)amino)phenyl)acrylonitrile, which crystallizes as two polymorphs and one tetrahydrofuran solvate. All three forms are emissive, but they have different mechanical properties. Specifically, two of the forms that are unsolvated polymorphs (denoted A and B) were found to be brittle and plastic, respectively, while the third form, which is a solvate (denoted C), showed excellent elasticity. Notably, form C becomes plastic after the crystal is desolvated. Single-crystal X-ray diffraction (SCXRD) and mechanical testing were performed to obtain better insight into the root-cause for the observed difference in mechanical properties. Since crystals of forms B and C are mechanically compliant as well as optically transparent, they were tested as flexible single-crystal optical waveguides.
Subjects
  • Elastic and plastic d...

  • Flexible optoelectron...

  • Mechanical compliance...

  • Mechanical response

  • Root cause

  • Schiff-base

  • Tetra-hydrofuran

  • Tetrahydrofurans

  • X- ray diffractions

  • Mechanical testing

  • Optical waveguides

  • Single crystals

Scopus© citations
2
Acquisition Date
Oct 25, 2022
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Acquisition Date
Jan 30, 2023
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