应用化学 ›› 2022, Vol. 39 ›› Issue (5): 852-854.DOI: 10.19894/j.issn.1000-0518.210175

• 研究简报 • 上一篇    下一篇

二甲基亚砜对乙酸气相色谱保留时间的影响及其机理

牧仁1(), 那顺2, 那仁朝格图1, 李重九3   

  1. 1.蒙古国国立教育大学数学与自然科学学院化学系,乌兰巴托 210648,蒙古
    2.安捷伦科技有限公司,北京 100102
    3.中国农业大学理学院,北京 100193
  • 收稿日期:2021-04-07 接受日期:2021-08-12 出版日期:2022-05-01 发布日期:2022-05-24
  • 通讯作者: 牧仁

Effect of Dimethyl Sulfoxide on the Retention Time of Acetic Acid in Gas Chromatography and Its Mechanism

Ren MU1(), Shun NA2, Natsagdorj NARANTSOGT1, Chong-Jiu LI3   

  1. 1.Department of Chemistry School of Mathematic and Natural Science Mongolian National University of Education,Ulaanbaatar 210648,Mongolia
    2.Agilent Technologies China Co. ,Ltd. ,Beijing 100102,China
    3.China Agricultural University College of Science,Beijing 100193,China
  • Received:2021-04-07 Accepted:2021-08-12 Published:2022-05-01 Online:2022-05-24
  • Contact: Ren MU
  • About author:muren117@gmail.com

摘要:

通过气相色谱、红外光谱分析和量子化学计算,探究溶于二甲基亚砜(DMSO)中乙酸保留时间发生波动的原因。 结果显示,乙酸保留时间变化与DMSO体积等量递增呈线性关系,R2=0.99301;根据红外光谱分析得出,DMSO和乙酸之间生成了氢键,以DMSO-乙酸分子的形式通过色谱柱;根据Gaussian09程序计算结果,DMSO电子密度大的部分给予电子,与乙酸之间形成了氢键,而DMSO电子密度小的部分容易获得电子与具有强偶极矩的色谱柱固定液聚乙二醇产生作用力,吸附在固定液上。因此,在上述一系列复杂的分子间作用力的共同影响下,乙酸保留时间发生了波动,且随着溶剂DMSO体积比增加,乙酸保留时间不断延长。

关键词: 气相色谱, 保留时间, 二甲基亚砜, 乙酸, 氢键

Abstract:

The mechanism for the fluctuation of the retention time of acetic acid dissolved in dimethyl sulfoxide (DMSO) was explored through gas chromatography, infrared spectroscopy, and quantum chemical calculations. Our results indicate that the change in retention time of acetic acid is linearly related to the increase of the volume of DMSO (R2=0.99301). Infrared spectroscopy analysis shows that a hydrogen bond is formed between DMSO and acetic acid, which passes through the column in the form of DMSO-acetic acid molecules. According to the calculation results of the Gaussian09 program, the high electron density portion of DMSO gives electrons and forms a hydrogen bond with acetic acid, while the portion with the low electron density can easily obtain electrons and form bonds with polyethylene glycol, a column stationary phase with a strong dipole moment, and then adsorb on the fixed liquid. Therefore, under the combined influence of this series of complex intermolecular forces, the retention time of acetic acid fluctuates, and the retention time of acetic acid increases together with the volume ratio of the DMSO solvent.

Key words: Gas chromatography, Retention time, Dimethyl sulfoxide, Acetic acid, Hydrogen bond

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