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Molecular Orientation and Structure in LB Films of a Liquid Crystal MPUOPM Investigated by UV-Vis and IR Spectroscopy
Yu-chuan Cheng*, Bing Zhao, Xu Wang, Wei-qing Xu
Author NameAffiliationE-mail
Yu-chuan Cheng* Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China; Key Laboratory of Supramolecular Structure and Material, Jilin University, Changchun 130012, China yccheng@nimte.ac.cn 
Bing Zhao Key Laboratory of Supramolecular Structure and Material, Jilin University, Changchun 130012, China  
Xu Wang Key Laboratory of Supramolecular Structure and Material, Jilin University, Changchun 130012, China  
Wei-qing Xu Key Laboratory of Supramolecular Structure and Material, Jilin University, Changchun 130012, China  
Abstract:
"?Langmuir monolayers and LB films of 4-((s)-2-methylbutoxy)phenyl-(4'-(10-undecen-1-oyloxy)phenyl) methylenimine (MPUOPM) were investigated by ultraviolet-visible, polarized infrared spectroscopy. ?-A isotherms showed well-defined Langmuir monolayers were formed at an air/water interface for the MPUOPM and their mixture with SA. An inflection point at 13 mN/m appeared on the isotherm, which was due to the transition from the monolayer to multilayer. The polarized IR spectra of LB films of MPUOPM had provided new insight into the molecular orientation and structure. In LB films, the tilted angle between the alkyl chain and the normal line of the substrate was 48ffi, the tilted angle between the dipole moment of C=N and the normal line of the substrate was 51ffi. The alkyl chains assumed a trans-zigzag conformation but it included a few gauche conformers. The C=N groups were almost in one plane in the LB films. "
Key words:  Langmuir, ?-A isotherm, Polarized IR
FundProject:
一种液晶化合物LB膜中的分子取向及膜结构
程昱川*,赵冰,王旭,徐蔚青
摘要:
"利用LB技术制备出MPUOPM的Langmuir和LB膜.随着表面压力的升高,在?-A曲线上的可观察到一个明显的折点.通过与分子刚性基团的理论截面积相比较,发现该折点反映的是单层膜向多层膜的转变.紫外可见、偏振红外等光谱被用来研究膜的结构,发现烷基链与基片法线夹角为48o,C=N基团互相平行,与基片法线呈51o夹角排列."
关键词:  Langmuir,?-A曲线,偏振红外
DOI:10.1088/1674-0068/20/06/675-679
分类号: