Citation: YU Xiao-Chun, LIN Ke, HU Nai-Yin, ZHOU Xiao-Guo, LIU Shi-Lin. Effects of Salts on theMicrostructure ofMethanol[J]. Acta Physico-Chimica Sinica, ;2010, 26(09): 2473-2480. doi: 10.3866/PKU.WHXB20100922 shu

Effects of Salts on theMicrostructure ofMethanol

1.
Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics,University of Science and Technology of China, Hefei 230026, P. R. China

Received Date: 25 May 2010
Available Online: 15 July 2010
Fund Project: 国家自然科学基金(20873131, 20928002) (20873131, 20928002)国家重点基础研究发展规划项目(973) (2007CB815204)资助 (973) (2007CB815204)

We studied the effects of salts on the microstructure of liquid methanol using the Raman spectra. We compared the excess Raman spectra of different methanolic salt solutions in the O—H and C—O stretching regions. These regions reflect the interactions between anions (cations) and methanol molecules. In the O—H stretching region, the excess spectra show that the anions interact with methanol molecules by weak hydrogen bonding and the strength of the hydrogen bonds decrease according to the order: CH₃OH-CH₃OH>Cl--CH₃OH>NO- ₃ -CH₃OH>ClO- ₃ -CH₃OH. Additionally, no interactions between cations and methanol molecules are apparent, as determined after analysis of this region. In the C—O stretching region, the excess Raman spectra show the interactions between anions (cations) and methanol molecules. The C—O stretching vibration frequencies of methanol that interact with the anions and cations increase according to the order: CH₃—OH (anions)3—OH (bulk)3—OH (cations). According to the excess Raman spectra in the C—O stretching region, we fitted the Raman spectra and used the fitting results to determine the solvation numbers in the first solvation shell of the ions. The Raman spectra show that the ions do not affect the microstructure of liquid methanol beyond the first solvation shell at this concentration (~0.005).
- Raman spectrum,
- Anion,
- Cation,
- Methanol,
- First solvation shell
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沈阳化工大学材料科学与工程学院沈阳 110142