Infrared Spectroscopic Study of Liquid CrystallineN-[4-(4-n-alkoxybenzoyloxy)-2-hydroxybenzylidene]-3-cyanoanilines
作者:
S. Sakagami,
K. Nonaka,
T. Koga,
A. Takase,
期刊:
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
(Taylor Available online 1998)
卷期:
Volume 312,
issue 1
页码: 23-32
ISSN:1058-725X
年代: 1998
DOI:10.1080/10587259808042428
出版商: Taylor & Francis Group
关键词: Nematic;salicylidene aniline derivative;3-cyano anilines;infrared spectroscopy;molecular conformation
数据来源: Taylor
摘要:
A homologous series ofN-[4-(4-n-alkoxybenzoyloxy)-2-hydroxybenzylidene]-3-cyanoanilines [AHC(n;n= 1–8, 10, 12)] was synthesized. AHC(4–8, 10) exhibit a monotropic nematic phase. The temperature dependence of infrared (IR) spectra of AHC(4–8) has been observed in the spectral range of 2300–600cm−1. On cooling, the intensity of the IR band at 2230cm−1remained unchanged through the phase-transition of isotropic-nematic and increased gradually toward room temperature (solid phase). This band can be assigned to the C ≡ N stretching vibrational mode. The wavenumber of the band increased slightly (about 1 cm−1) during the temperature from isotropic to solid. Inmela-CN substituted AHC, it is suggested that the CN group may not play a dominant role in the intermolecular interaction.
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