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Open Chemistry

formerly Central European Journal of Chemistry

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Volume 13, Issue 1


Volume 13 (2015)

Synthesis, Photo-sensitive and Electrochemical Properties of Rod-like Aromatic Aldehyde with Azo Bridge

Minyan Zheng
  • Corresponding author
  • School of Chemistry and Chemical Engineering, Xianyang Normal University, Shaanxi, China
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Yongsheng Wei / Wei Geng
Published Online: 2015-08-05 | DOI: https://doi.org/10.1515/chem-2015-0122


Eight new rod-like liquid crystal molecules composed by a long rigid core of three six-member rings (cyclohexane ring or benzene ring), azo, ester and terminal aldehyde groups have been prepared. These rod-like liquid crystalline molecules were designed to construct new structures to further study photo-isomerization in their mesophases. All the compounds have been characterized based on their basic spectral data, differential scanning calorimeter (DSC) and hot stage polarizing optical microscope (HS-POM). The result showed that all the molecules, even those with the shortest terminal methyl group, have liquid crystalline properties. Their mesophases are nematic within the temperature ranges from 85 to 145°C. They exhibit photo-sensitivities not only in methanol solutions but also in a mesophase when exposed to UV light. The highest occupied orbital (HOMO) and the lowest unoccupied orbital (LUMO) and the differences between the frontier molecular orbitals (Eg) of these compounds were determined by cyclic voltammetry. The effect of even-odd carbon number of the terminal straight alkyl chain on the UV spectral data and the Eg were observed. The difference between the Eg of these compounds are in excellent agreement with the difference of their maximum absorption wavelength in UV spectra.

Graphical Abstract

Keywords : liquid crystal; photo-sensitive; frontier molecular orbital; azo group; aromatic aldehyde


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About the article

Received: 2014-12-10

Accepted: 2015-06-09

Published Online: 2015-08-05

Citation Information: Open Chemistry, Volume 13, Issue 1, ISSN (Online) 2391-5420, DOI: https://doi.org/10.1515/chem-2015-0122.

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© 2015 Minyan Zheng et al.. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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