The Shackling Effect in Cyclic Azobenzene Liquid Crystal

Yang Xiao; Chong He; Zi-Fan Yang; Er-Qiang Chen; Huan-Jun Lu; Xiao-Hong Li; Ying-Feng Tu

doi:10.1007/s10118-022-2675-7

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The Shackling Effect in Cyclic Azobenzene Liquid Crystal

RESEARCH ARTICLE | Updated：2022-05-24

- The Shackling Effect in Cyclic Azobenzene Liquid Crystal
- Chinese Journal of Polymer Science Vol. 40, Issue 6, Pages: 584-592(2022)
- Affiliations：
  
  a.State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
  b.Beijing National Laboratory for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Center for Soft Matter Science and Engineering, College of Chemistry, Peking University, Beijing 100871, China
  c.Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application, School of Physical Science and Technology, Suzhou University of Science and Technology, Suzhou 215009, China
- Author bio：
  
  tuyingfeng@suda.edu.cn
- Funds：
- DOI：10.1007/s10118-022-2675-7
  CLC：
- Received：22 November 2021，
  
  Revised：2021-11-29，
  
  Accepted：30 November 2021，
  
  Online First：10 February 2022，
  
  Published：01 June 2022
- Accepted：
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Xiao, Y.; He, C.; Yang, Z. F.; Chen, E. Q.; Lu, H. J.; Li, X. H.; Tu, Y. F. The shackling effect in cyclic azobenzene liquid crystal. Chinese J. Polym. Sci. 2022, 40, 584–592

Yang Xiao, Chong He, Zi-Fan Yang, et al. The Shackling Effect in Cyclic Azobenzene Liquid Crystal[J]. Chinese Journal of Polymer Science, 2022, 40(6): 584-592.
Xiao, Y.; He, C.; Yang, Z. F.; Chen, E. Q.; Lu, H. J.; Li, X. H.; Tu, Y. F. The shackling effect in cyclic azobenzene liquid crystal. Chinese J. Polym. Sci. 2022, 40, 584–592 DOI： 10.1007/s10118-022-2675-7.

Yang Xiao, Chong He, Zi-Fan Yang, et al. The Shackling Effect in Cyclic Azobenzene Liquid Crystal[J]. Chinese Journal of Polymer Science, 2022, 40(6): 584-592. DOI： 10.1007/s10118-022-2675-7.

摘要

The shackling effect was revealed here in cyclic azobenzene deravitives due to ring strain

which induces the liquid crystal phase by reducing the entropy change during phase transitions

and limits the

trans

-to-

cis

isomerization of azobenzene units under UV-light.

Abstract

We demonstrate here a novel method for the design of liquid crystals (LCs)

via

the cyclization of mesogens by flexible chains. For two azobenzene-4

4′-dicarboxylate derivatives

the cyclic dimer

cyclic bis(tetraethylene glycol azobenzene-4

4′-dicarboxylate) (CBTAD)

shows LC properties with smectic A phase

while its linear counterpart

bis(2-(2′-hydroxyethyloxy)ethyl azobenzene-4

4′-dicarboxylate (BHAD)

has no LC phase. The difference is ascribed to the shackling effect from the cyclic topology

which leads to the much smaller entropy change during phase transitions and increases the isotropic temperature greatly for cyclics. In addition

the

trans-

-cis

isomerization of azobenzene groups under UV-light is also limited in CBTAD. With the reversible isomerization of azobenzene groups

CBTAD showed interesting isothermal phase transition behaviors

where the LC phase disappeared upon photoirradiation of 365 nm UV-light

and recovered when the UV-light was off. Combined with the smectic LC nature

a novel UV-light tuned visible light regulator was designed

by simply placing CBTAD in two glass plates. The scattered phase of smectic LC was utilized as the “OFF” state for light passage

while the UV-light induced isotropic phase was utilized as the “ON” state. The shackling effect outlined here should be applicable for the design of cyclic LC oligomers/polymers with special properties.

关键词

Keywords

references

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