Photo-responsive liquid crystals derived from azobenzene centered cholesterol-based tetramers

Monika Gupta; Vaibhav Pal; Santanu Kumar Pal

doi:10.1039/C7NJ05142E

Photo-responsive liquid crystals derived from azobenzene centered cholesterol-based tetramers

Monika Gupta,^a Vaibhav Pal^a and Santanu Kumar Pal*^a

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* Corresponding authors

^a Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector-81, Knowledge City, Manauli-140306, India
E-mail: skpal@iisermohali.ac.in, santanupal.20@gmail.com

Abstract

This paper demonstrates the design and synthesis of azobenzene centred cholesterol based tetramers. A series of eight oligomeric compounds with varying flexible alkyl spacers (n = 1–8) is reported. These compounds displayed enantiotropic and monotropic chiral nematic (N*) mesophases, which were characterized by polarized optical microscopy (POM), differential scanning calorimetry (DSC) and X-ray scattering studies (SAXS/WAXS). We have also explored the photoisomerization behaviour of the compounds with n = 1 and n = 8. Although no photoisomerization effect was observed in the liquid crystalline (LC) state, it was, however, noticed in dilute solutions and monolayers, as depicted from UV-vis studies and Brewster angle microscopy (BAM), respectively.

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Publication details

The article was received on 27 Dec 2017, accepted on 10 Apr 2018 and first published on 10 Apr 2018

Article type: Paper

DOI: 10.1039/C7NJ05142E

Citation: New J. Chem., 2018,42, 8765-8772

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Photo-responsive liquid crystals derived from azobenzene centered cholesterol-based tetramers

M. Gupta, V. Pal and S. K. Pal, New J. Chem., 2018, 42, 8765
DOI: 10.1039/C7NJ05142E
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New Journal of Chemistry

Photo-responsive liquid crystals derived from azobenzene centered cholesterol-based tetramers

Abstract

Supplementary files

Publication details

Photo-responsive liquid crystals derived from azobenzene centered cholesterol-based tetramers

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