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

Santanu Kumar Pal,  Monika Gupta  and  vaibhav pal 

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*) mesophase which has been 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, however, it was 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, Accepted Manuscript
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    Photo-responsive liquid crystals derived from azobenzene centered cholesterol-based tetramers

    S. K. Pal, M. Gupta and V. pal, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C7NJ05142E

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