Raman and IR spectroscopy research on hydrogen bonding in water-ethanol systems

被引：175

作者：

Burikov, Sergey ^{[1
]}

Dolenko, Tatiana ^{[1
]}

Patsaeva, Svetlana ^{[1
]}

Starokurov, Yuriy ^{[1
]}

Yuzhakov, Viktor ^{[1
]}

机构：

[1] Moscow MV Lomonosov State Univ, Dept Phys, Moscow 119991, Russia

来源：

MOLECULAR PHYSICS | 2010年 / 108卷 / 18期

关键词：

Raman scattering; IR absorption spectra; stretching vibrations; hydrogen bonding; ethanol hydrates; MULTIVARIATE CURVE RESOLUTION; CLATHRATE HYDRATE FORMATION; X-RAY-DIFFRACTION; LIQUID WATER; FLUCTUATION THEORY; VIBRATION-SPECTRA; LIGHT-SCATTERING; BINARY-MIXTURES; ALCOHOL; TEMPERATURE;

D O I：

10.1080/00268976.2010.516277

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070305 [高分子化学与物理];

摘要：

Vibrational spectroscopy provides invaluable information about hydrogen bonding in aqueous solutions. To study changes in H-bonding due to increase of ethanol concentration in water, we perform research on water-ethanol binary mixtures with various mixing ratios using a combination of Raman scattering and IR absorption techniques. We study Raman spectra from 200 to 4000 cm-1 excited at 488 nm and IR spectra from 500 and 4000 cm-1 for solutions with different ethanol concentrations from pure water to pure ethanol. Using the intensity ratio of OH stretching band taken at 3200 and 3420 cm-1 for Raman spectra and at 3240 and 3360 cm-1 for IR spectra we evaluate the strength of H-bonding. Maximal strength of H-bonding in water-ethanol mixture corresponds to ethanol concentration 15-20% w/w. We explain it by the presence of transient ethanol hydrates similar in composition to gaseous clathrates with stoichiometric water/ethanol ratio 5:1. Further weakening of H-bonding with ethanol concentration is caused by the formation of chain aggregates from ethanol/water molecules. In addition, we apply other approaches, such as multivariate curve resolution-alternating least squares analysis, decomposition of water Raman stretching band, and comparison of water Raman stretching band in ethanol solutions to that of gas clathrates to support this hypothesis.

引用

页码：2427 / 2436

页数：10

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