高等学校化学学报 ›› 2012, Vol. 33 ›› Issue (06): 1271.doi: 10.3969/j.issn.0251-0790.2012.06.025

• 物理化学 • 上一篇    下一篇

利用和频振动光谱研究空气/短链脂肪酸界面的分子取向

黄芝1,2, 郭源1   

  1. 1. 中国科学院化学研究所, 北京分子科学国家实验室, 分子反应动力学国家重点实验室, 北京 100190;
    2. 中国科学院研究生院, 北京 100049
  • 收稿日期:2011-11-14 出版日期:2012-06-10 发布日期:2012-06-10
  • 通讯作者: 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 E-mail:guoyuan@iccas.ac.cn
  • 基金资助:

    国家自然科学基金(批准号: 21073199)和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.

Sum Frequency Generation Vibrational Spectroscopy Study of Serial Short Chain Fatty Acids Liquid/Air Interfaces

HUANG Zhi1,2, GUO Yuan1   

  1. 1. Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China;
    2. Graduate School of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2011-11-14 Online:2012-06-10 Published:2012-06-10

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.

关键词: 短链脂肪酸, 分子取向角, 气/液界面, 和频振动光谱

Abstract: 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 addressed 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.

Key words: Short chain fatty acid, Molecular orientational angle, Air/liquid interface, Sum frequency gene-ration vibrational spectroscopy(SFG-VS)

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