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首页> 外文期刊>Spectrochimica acta, Part A. Molecular and biomolecular spectroscopy >Structure and phase transition in self-assembled films of an anti-ferroelectric liquid crystal studied by two-dimensional correlation FTIR spectroscopy
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Structure and phase transition in self-assembled films of an anti-ferroelectric liquid crystal studied by two-dimensional correlation FTIR spectroscopy

机译：二维相关FTIR光谱研究反铁电液晶自组装膜的结构和相变

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The FTIR spectra were measured for a self-assembled film of the anti-ferroelectric liquid crystal (AFLC) molecules over a temperature range of 40-150degreesC. The frequency and intensity variations of the infrared spectra were discussed in terms of changes in molecular orientation, conformation and intra- and/or inter-molecular interaction during phase transitions. The two-dimensional (2d) correlation analysis revealed that two hydrocarbon chains have different orientation behaviors, the shorter hydrocarbon chain is parallel to molecular long axis and the longer one is perpendicular to it. The splitting of the C=O stretching band indicated that the s-cis and the s-trans conformers of the ester group coexist in the self-assembly film. During the phase transitions, in mesogen part the C=O group adjacent to the chiral part is first response with temperature changing, following the C=O group between two phenyl rings, and eventually the phenyl rings; and the respondence with temperature of methyl is slower than that of methylene in alkyl chains. (C) 2004 Elsevier B.V. All rights reserved.
机译：在40-150°C的温度范围内测量反铁电液晶（AFLC）分子自组装膜的FTIR光谱。根据相变过程中分子取向，构象以及分子内和/或分子间相互作用的变化，讨论了红外光谱的频率和强度变化。二维（2d）相关性分析表明，两条烃链具有不同的取向行为，较短的烃链与分子长轴平行，而较长的烃链垂直于分子长轴。 C ＝ O拉伸带的分裂表明酯基团的s-顺式和s-反式构象异构体共存于自组装膜中。在相变过程中，在液晶元部分中，与手性部分相邻的C = O基团是温度变化的第一响应，跟随两个苯环之间的C = O基团，最后是苯环。烷基链中甲基的温度响应比亚甲基慢。 （C）2004 Elsevier B.V.保留所有权利。

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