Effect of alkoxy chain density on the mesogenic properties of aroylhydrazone based liquid crystals: synthesis, characterisation, photophysical and gelation behaviour

Kanth, P. Chandra; Singh, Hemant Kumar; Kumar, Vijay; Singh, Sachin Kumar; Rao, D. S. Shankar; Prasad, S. Krishna; Singh, Bhanu Pratap

doi:10.1080/02678292.2020.1725164

Cited by 8 publications

(1 citation statement)

References 49 publications

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“…The lower absorption peak captured at a short region of wavelength due to the occurrence of HOMO-LUMO transition and is designated as πÀ π* transition towards the benzene rings, although the higher energy shoulder peak appeared at a wide region of wavelength is connected to a symmetry approved nÀ π* transition compelling the π-electronic nature during the entire compound with charge transfer characteristics. [54,55] Both compounds showed a peak at a very short wavelength region and further move towards the red-shift with stronger absorption peak with higher intensity. Further for detailed investigation, we have observed the photoisomerization process at different time intervals (Figure 12).…”

Section: Photophysical Behaviormentioning

confidence: 96%

Thiacalixarene Appended Azo‐based Supramolecular Systems: Self‐assembly and Photo Tuning Reversible Liquid Crystalline Properties

et al. 2023

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Four new azo‐based supramolecular materials containing thiacalixarene core substituted by variable alkoxy groups (TFA1–TFA4) have been designed and synthesized for the mesomorphic and photoswitching properties. The liquid crystalline behavior were accomplished by using DSC, POM, and XRD studies. All azo‐based thiacalixarene based materials with short and higher chain length display columnar hexagonal mesophase with broad temperature range. The thermal behavior of all the materials was investigated by DSC and TGA study. The structural and conformational study of the lower rim functionalized materials was confirmed by using different techniques. These thiacalixarene moulded liquid crystalline compounds shows columnar self‐assembly type behavior and higher thermal stability. The introduction of bi‐substituted azo‐ester network towards the lower rim of thiacalixarene core has impact on the electron delocalization and liquid crystalline properties. The photoswitching properties suggested cis and trans azo‐isomerization under radiation of UV light and higher thermal back relaxation time. The mesogenic behaviour of compound TFA2 and TFA4 were demolished by the influence of cis and trans isomerization. The structure‐property correlation is studied to understand the variation in mesogenic properties with the substitution of variable alkoxy side chain.

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Section: Photophysical Behaviormentioning

confidence: 96%