2021/09/21 by В. А. Чорноус, V. Chornous, V. Bratenko +21
Chemistry · Materials Science · Physics and Astronomy · #FOS: Physical sciences #Liquid Crystal Research Advancements #Molecular spectroscopy and chirality #Photochromic and Fluorescence Chemistry #Soft Condensed Matter (cond-mat.soft) #cond-mat.soft
paper · pdf · doi:10.48550/arxiv.2109.09967
37 pages, 17 figures
arxiv created 2021/09/21 · openalex publication_date 2021/09/21 · arxiv updated 2021/09/22 · openalex created_date 2021/09/27 · openalex updated_date 2026/07/28
We present the newly synthesized chiral dopant 2-[(2-isopropyl-5-methylcyclohexyl)oxy]-2-oxoethyl 4-(E)-[4-(decyloxy)phenyl]diazenylbenzoate (ChD-3501), consisting of azo- and aliphatic fragments together with a chiral center based on l-menthol as a reversible light-controllable chiral dopant. To assess the effects of UV/VIS irradiation and temperature in the isotropic and liquid crystalline (LC) states, we studied the spectral kinetics of ethanol solution of ChD-3501, as well as induction of the cholesteric helix when it was dissolved in nematic LC (E7) as a chiral dopant. The concentration dependence of the helical pitch of the induced cholesterics was studied by means on Grandjean-Cano method, and the helical twisting power of ChD-3501 in the nematic host E7 was determined. The reversible trans-cis isomerization of chiral dopandt ChD-3501 in E7 under UV/VIS irradiation was studied, and it has been found that the storage of the cis-isomer at certain constant temperature also leads to the reversible isomerisation, which presents a certain interest for applications.