Studies of de Vries SmA type phase in chiral thiobenzoates

The nature of the SmA*-SmC* phase transition was studied in three chiral liquid crystal compounds, in two belonging to the same homologous series, (S)-1-methylheptyl-4-(4′-alkoxybiphenylthiocarboxy)-benzoates, (S)-MHPSBOn, where n = 7 and 8 is the number of carbon atoms in the alkyl chain and (S)-4-...

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Bibliographic Details
Published in:Phase transitions 2023-02, Vol.96 (2), p.157-165
Main Authors: Chruściel, Janusz, Rudzki, Arkadiusz, Ossowska-Chruściel, Mirosława D., Zalewski, Sławomir
Format: Article
Language:English
Subjects:
Atomic properties
Benzoates
biphenyl and phenyl thioesters
Carbonyls
de Vries phase
electro-optic properties
ferroelectric and antiferroelectric phases
Liquid crystals
Phase transitions
Smectic phases
X-ray measurements
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Summary:The nature of the SmA*-SmC* phase transition was studied in three chiral liquid crystal compounds, in two belonging to the same homologous series, (S)-1-methylheptyl-4-(4′-alkoxybiphenylthiocarboxy)-benzoates, (S)-MHPSBOn, where n = 7 and 8 is the number of carbon atoms in the alkyl chain and (S)-4-[(4-{1-methylheptylcarboxyl} phenyl) carbonylthio] phenyl-4′-decyloxy-1-benzenecarboxylate (10OPOSMH). Compounds (S)-MHPSBO7 and (S)-MHPSBO8 show different behavior in the SmA*-SmC* phase transition, in MHPSBO7 the SmA* phase is the de Vries phase, while in MHPSBO8 it is the classic SmA* phase. The aim of the study is to demonstrate the presence of the de Vries type SmA * phase in three chiral thiobenzoates. The electro-optical method and SAXS were used to analyze the SmA*-SmC* transition.
ISSN:0141-1594
1029-0338
DOI:10.1080/01411594.2022.2159403