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

Gupta, Monika; Pal, Vaibhav; Pal, Santanu Kumar

By 12 March 2019No Comments

New Journal of Chemistry, 2018, vol 42, 11, pp. 8765-8772



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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