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The effect of the length of terminal n-alkyl carboxylate chain on selfassembling and photosensitive properties of chiral lactic acid derivatives

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cris.lastimport.scopus2024-02-12T20:14:38Z
dc.abstract.enA newseries of photosensitive azomaterials possessing a chiral alkyl lactatemoiety and terminal n-alkyl carboxylate unit close to the azo group has been synthesized and studied. The length of the n-alkyl carboxylate chain has been systematically varied in order to establish the effect of the molecular structure on the self-assembling behaviour. Two series of materials possessing hexyl and dodecyl alkyl chains in the chiral part of the molecule have been studied. It has been shown that the length of both the alkyl chains strongly influences the mesomorphic behaviour, however, each chiral/achiral chain has different utility to tune themesomorphic properties.With exception of the compound with the longest chains, all studied compounds exhibited the chiral tilted ferroelectric smectic C* phase. Based on the combination of terminal alkyl chains, chiral nematic, orthogonal smectic A*, and twist grain boundary smectic A* phases have been detected on cooling beyond the SmC* phase. The presence of the photosensitive functional N=N group in the molecular core allowed further tuning of the material properties by UV light illumination. The E-to-Z photoisomerization of the azo group and subsequent thermal backisomerisation have been studied in solution by nuclear magnetic resonance and most importantly in the mesophases on bulk samples. We report on UV-induced isothermal switching from chiral smectic and nematic mesophases into the isotropic phase, respectively, and differences in the textures of mesophase upon restoration of the ordered liquid.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorPociecha, Damian
dc.contributor.authorPoryvai, Anna
dc.contributor.authorKohout, Michal
dc.contributor.authorSvoboda, Jiří
dc.contributor.authorBubnov, Alexej
dc.date.accessioned2024-01-26T10:11:43Z
dc.date.available2024-01-26T10:11:43Z
dc.date.issued2019
dc.description.financeNie dotyczy
dc.description.volume275
dc.identifier.doi10.1016/J.MOLLIQ.2018.11.058
dc.identifier.issn0167-7322
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/122216
dc.languageeng
dc.pbn.affiliationchemical sciences
dc.relation.ispartofJournal of Molecular Liquids
dc.relation.pages829-838
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.subject.enChiral liquid crystals
dc.subject.enFerroelectric phase
dc.subject.enPhotosensitive liquid crystals
dc.subject.enOptical switches
dc.subject.enE-Z isomerisation
dc.subject.enNMR spectroscopy
dc.subject.enAzo group
dc.titleThe effect of the length of terminal n-alkyl carboxylate chain on selfassembling and photosensitive properties of chiral lactic acid derivatives
dc.typeJournalArticle
dspace.entity.typePublication