A new equation to reproduce the enthalpies of transfer of formamide, N-methylformamide and N,N-dimethylformamide from water to aqueous methanol mixtures at 298 K

被引：21

作者：

Behbehani, GR ^{[1
]}

Ghamamy, S ^{[1
]}

机构：

[1] Imam Khomeini Int Univ, Dept Chem, Qazvin, Iran

来源：

THERMOCHIMICA ACTA | 2006年 / 444卷 / 01期

关键词：

titration calorimetry; preferential solvation; DMF; variable (an plus beta N);

D O I：

10.1016/j.tca.2006.02.028

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The enthalpies of transfer of formamide (Form) N-methylformamide (NMF) and N,N-dimethylformamide (DMF) from water to aqueous methanol mixtures are reported and analysed in terms of the new solvation theory. It was found that a previous equation could not reproduce these data over the whole range of solvent compositions. Using the new solvation theory to reproduce the enthalpies of transfer shows excellent agreement between the experimental and calculated data over the entire range of solvent compositions. The analyses show that the solvation of DMF is random in the aqueous methanol mixtures while Form and NMF are preferentially solvated by methanol. It is also found that the interaction of the solutes is stronger with methanol than with water. (C) 2006 Elsevier B.V. All rights reserved.

引用

页码：71 / 74

页数：4

共 16 条

[1] Nonelectrolyte solvation in aqueous dimethyl sulfoxide - A calorimetric and infrared spectroscopic study [J].