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Citation: Zou Shou-Zhong, Chen Yan-Xia, Tian Zhong-Qun, Zhang Yun-Hong. Studies on the Effects of Inorganic Ions and their Concentrations on Raman Spectra of Water[J]. Acta Physico-Chimica Sinica, ;1996, 12(02): 130-135. doi: 10.3866/PKU.WHXB19960208 shu

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

1.
State Key Laboratory for Physical Chemistry of Solid Surfaces,Xiamen University,Xiamen 361005

Received Date: 11 May 1995
Available Online: 15 February 1996

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.
- Raman spectroscopy,
- Water,
- Hydrogen-bond
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