物理化学学报 >> 1996, Vol. 12 >> Issue (02): 130-135.doi: 10.3866/PKU.WHXB19960208

研究论文 上一篇    下一篇

不同电解质体系水的拉曼谱的研究

邹受忠,陈燕霞,田中群,张韫宏   

  1. 厦门大学固体表面物理化学国家重点实验室,厦门 361005|北京理工大学化工与材料学院,北京 100081
  • 收稿日期:1995-05-11 修回日期:1995-08-15 发布日期:1996-02-15
  • 通讯作者: 张韫宏

Studies on the Effects of Inorganic Ions and their Concentrations on Raman Spectra of Water

Zou Shou-Zhong,Chen Yan-Xia,Tian Zhong-Qun,Zhang Yun-Hong   

  1. State Key Laboratory for Physical Chemistry of Solid Surfaces,Xiamen University,Xiamen 361005|College of Chemical Engineering and Material Science,Beijing Institute of Technology,Beijing 100081
  • Received:1995-05-11 Revised:1995-08-15 Published:1996-02-15
  • Contact: Zhang Yun-Hong

摘要:

通过一系列电解质体系水的拉曼光谱测量,得到了阴、阳离子种类和浓度引起的水伸缩振动和弯曲振动谱带丰富的变化信息.ClO4-能有效地破坏水分子间的氢键,随着ClO4-浓度的增加,水分子间的氢键并非逐步被打断,而是氢键被破坏的水分子越来越多,从而使水分子有序度增大,这种氢键破坏方式符合水的混合模型(Mixture Model).SO42-浓度的增加对水的Raman光谱影响较小,是由于SO42-与水分子间有氢键作用的结果.虽然阳离子浓度对水的Raman光谱影响很小,但不同阳离子体系水的Raman谱有较大的差别,Li十与Cs十会引起水分子的拉曼谱较大的变化,Na十与K十对水的拉曼谱影响都不大.

关键词: 拉曼谱, 水, 氢键

Abstract:

Raman spectra of aqueous solutions containing ClO4- SO42- , Li+, Na+ , K+ , Cs+ were measured. The effects of the concentrations and the properties of these ions on the frequencies, band shape and relative strength of the stretching and bending vibration bands of water molecules were compared in detail. With increasing the concentration of ClO4-, a typical structure-breaking anion, the strengh of the O-H stretching vibration peaks at lower wavenumber (3244 and 3396 cm-1) decreases and a new peak at higher wave number (3552 cm-1) appears and is becoming the strongest one at the 8 mol﹒L-1 NaClO4 solution, this is obviously different from the temperature-dependent Raman spectra of pure water in that the O-H stretching vibration frequency continuously shifts to higher wavenumber with increasing temperature, indicating that the process of hydrogen-bond breaking by ClO4- between water molecules could be expressed by the mixture model. For SO42-, however, the concentration effect on the Raman spectra of water is very weak because SO42- is a structure-making anion which can form hydrogen bond with water molecules. It has been also found that Li+ and Cs+ have similar effects on the Raman spectra of water, while the effects of Na+ and K+ are very weak.

Key words: Raman spectroscopy, Water, Hydrogen-bond