Association state in ethanol-water solution with different ethanol concentration

作者：Zeng, Xin-An^*; Yang, Xing

来源：Journal of South China University of Technology(Natural Science Edition), 2010, 38(12): 120-123.

DOI：10.3969/j.issn.1000-565X.2010.12.023

• Association state
• Ethanol concentrations
• Ethanol-water solutions
• Mole fraction
• OH group
• Water molecule
• Weak hydrogen bond

This paper deals with the interaction between hydrogen bond association and ethanol content in ethanol-water solution by means of 1H NMR. The results show that (1) the weak hydrogen bond CH-O slightly changes with ethanol concentration; (2) CH2 is easier to form weak hydrogen bond and is more sensitive to ethanol concentration than-CH3; and (3) as for the strong hydrogen bond OH-O, OH groups in ethanol molecule are more sensitive to the concentration than water, and the strongest hydrogen bond association occurs at a mole fraction of ethanol (x) of 0.550. Furthermore, according to the association strength of hydrogen bond, the ethanol concentration can be approximately divided into three regions, namely, 0 < x < 0.236, 0.236 ≤ x ≤ 0.735 and 0.735 < x < 1.000. In the first region, there is a leading association in water molecule, while in the third region, there is a leading association in ethanol molecule, and, in the second region, the strongest and the widest hydrogen bond association net is formed by the interaction of ethanol and water molecules.

• 出版日期2010-12
• 单位华南理工大学