摘要
利用和频振动光谱(SFG-VS)方法检测了5种短链脂肪酸分子(乙酸、丙酸、正丁酸、正戊酸及正己酸)在空气/纯液体界面的结构,得到了3种偏振组合(ssp,ppp,sps)下的和频振动光谱.通过偏振选择定则对各个谱峰进行了指认和分析,同时计算出空气/纯脂肪酸液体界面上脂肪酸分子的甲基取向角.对比发现,从丙酸到己酸,分子甲基基团的界面取向角随碳链的增长略有增大.并对其机理进行了分析.
The air/pure liquid interfaces of five kinds of short chain fatty acids of acetic acid, propionic acid, butyric acid, pentanoic acid and hexanoic acid were addressod by sum frequency generation vibrational spectroscopy（SFG-VS） under three polarization combinations （ ssp, ppp, sps）. The vibrational modes of spectra peaks were assigned according to the polarization selection rules. Furthermore, the orientation of the fatty acid molecules at air/liquid interface was calculated. It was found that the orientation angles increase slightly with the increase of the length of carbon chain and the possible mechanism was proposed.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2012年第6期1271-1277,共7页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:21073199)
中国科学院知识创新工程重要方向项目计划(批准号:KJCX-EW-W09)资助
关键词
短链脂肪酸
分子取向角
气/液界面
和频振动光谱
Short chain fatty acid
Molecular orientational angle
Air/liquid interface
Sum frequency gene- ration vibrational spectroscopy（SFG-VS）
作者简介
联系人简介：郭源，男，副研究员，主要从事界面分子光谱和化学动力学研究．E-mail：guoyuan@iccas．ac．cn
