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化学学报
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化学学报 ›› 2005, Vol. 63 ›› Issue (24): 2238-2240. 上一篇    下一篇

研究简报

丝氨酸在醇-水溶液中的溶解焓

徐南1，林瑞森*,1，刘春丽1,2   

  1. (1浙江大学化学系 杭州 310027)
    (2枣庄学院化学化工系 枣庄 277160)
  • 投稿日期:2005-01-27 修回日期:2005-08-20 发布日期:2005-12-28
  • 通讯作者: 林瑞森

Enthalpies of Solution of L-Serine in Aqueous Alcoholic Solutions

XU Nan1, LIN Rui-Sen*,1, LIU Chun-Li1,2   

  1. (1 Department of Chemistry, Zhejiang University, Hangzhou 310027)
    (2 Department of Chemistry and Chemical Engineering, Zaozhuang University, Zaozhuang 277160)
  • Received:2005-01-27 Revised:2005-08-20 Published:2005-12-28
  • Contact: LIN Rui-Sen

PDF

899

被引次数

17

用RD-496III双热流精密微热量计测量了L-丝氨酸在纯水以及异丙醇、1,2-丙二醇和丙三醇水溶液中的溶解焓, 并计算了从水到醇-水溶液中的迁移焓. 实验发现, L-丝氨酸在水及醇-水溶液中的溶解焓都是正值, 它从水到醇-水溶液中的迁移焓也都是正值, 并且基本上随着醇浓度的增加而增加, 说明在溶解过程中, 溶质与混合溶剂分子的部分去水化吸热过程占主要地位. 另外, 实验还发现L-丝氨酸从水到异丙醇水溶液中的迁移焓大于在1,2-丙二醇水溶液中的, 更大于在丙三醇水溶液中的, 这是由于羟基的减少导致了疏水-亲水作用的增加和亲水-亲水作用的减弱.

关键词: 溶解焓, L-丝氨酸, 醇, 结构相互作用

The enthalpies of solution of L-serine were measured in water and aqueous solutions of isopropanol, 1,2-propanediol and propanetriol at 298.15 K with an RD-496III microcalorimeter. Enthalpies of transfer (ΔHtrs) of L-serine from water to aqueous solutions were calculated as well. From the experimental result it was found that both the values of enthalpies of solution and enthalpies of transfer of L-serines were positive, indicating that it was endothermic. They were increased with the increasing of concentration of alcohols. Such evidence illustrated that in the process of solution the endothermic of the partial dehydration of solute and molecules of mixed solution was predominant. In addition it was also found that the enthalpies of transfer of L-serine from water to aqueous isopropanol solution is larger than that from water to aqueous 1,2-propanediol and propanetriol solution. This could be illuminated by the reinforcement of hydrophilic-hydrophobic interaction and by the weakening of hydrophilic-hydrophilic interaction.

Key words: enthalpy of solution, L-serine, alcohol, interaction of structure