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Kinetics of thermal cistrans isomerization in a phototropic azobenzene-based single-component liquid crystal in its nematic and isotropic phases

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Abstract

Single-component azobenzene-based phototropic liquid crystals (PtLC) are promising materials that have started to be explored for photonic applications. One of the essential factors determining the applicability of these materials is the rate of the thermally driven cistrans isomerization. In this paper, the kinetics of the thermal back cis-to-trans reaction in a pure 4-hexyl-4′-methoxyazobenzene (6-AB-O1) compound in its isotropic liquid and nematic phases is studied (the undoped LC). The reaction rate constants, activation energies and thermal activation parameters were determined based on spectroscopic studies. The reaction kinetics is compared to that measured for the compound dissolved in chloroform. The results demonstrate that the thermal back reaction depends on the phase and molecular environment of the cis-isomer. Moreover, the effect of temperature on the absorption spectra of 6-AB-O1 in its isotropic, nematic and crystalline phases is examined. The changes in the compound's absorption spectra in the respective phases have been correlated to the positional order parameter S.

Graphical abstract: Kinetics of thermal cis–trans isomerization in a phototropic azobenzene-based single-component liquid crystal in its nematic and isotropic phases

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Publication details

The article was received on 06 Oct 2017, accepted on 21 Dec 2017 and first published on 21 Dec 2017


Article type: Paper
DOI: 10.1039/C7CP06820D
Citation: Phys. Chem. Chem. Phys., 2018, Advance Article
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    Kinetics of thermal cistrans isomerization in a phototropic azobenzene-based single-component liquid crystal in its nematic and isotropic phases

    A. Miniewicz, H. Orlikowska, A. Sobolewska and S. Bartkiewicz, Phys. Chem. Chem. Phys., 2018, Advance Article , DOI: 10.1039/C7CP06820D

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