Abstract
We prepared and studied bent-core liquid crystalline (LC) compounds based on 1,3-disubstituted benzene in a central part and azo-linkage attached directly to this bent core. We designed three structures and checked their mesogenic properties, as well as photosensitivity. We found that two studied compounds revealed columnar LC mesophases, which we transformed to the isotropic phase under the illumination of UV light. We concluded that only one type of structural motif was not mesogenic. For LC compounds, we established phases and phase transition temperatures based on differential scanning calorimetry (DSC) measurements and observations in a polarizing microscope. To confirm phase identification, X-ray studies were performed and structural parameters describing the columnar phases supplied.
Highlights
Liquid crystals (LCs) as intermediates between crystals and isotropic liquids serve as an example of media with a big potential for application
We suggest that theconstant reason for the above-mentioned of half-life the isotropic phase after illumination is determined rate was
We suggest that the reason for the above-mentioned stability of the isotropic phase after illumination is not fully related to the long-time stability of the Z-isomer but, to the inability to of the regenerated E-isomers to self-assemble due to high viscosity
Summary
Liquid crystals (LCs) as intermediates between crystals and isotropic liquids serve as an example of media with a big potential for application. Their ability to self-assemble, sensitivity to external stimuli and their electro-optical properties are attracting attention from various scientific fields [1,2,3,4]. Bent-core structures represent a subclass of LCs in which a polar order can be realized without molecular chirality. A variety of mesophases was found for bent-core molecules, including nematic, smectic and columnar phases. For tilted smectic SmCP phases, polar vectors of bent-core molecules can be oriented in a ferroelectric or antiferroelectric manner in the neighboring smectic layers, and the lower index
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