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首页> 外文期刊>Russian Journal of Physical Chemistry >Thermodynamic Functions of Solvation of 1,4-Dioxane in Various Solvents at 298.15 K
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Thermodynamic Functions of Solvation of 1,4-Dioxane in Various Solvents at 298.15 K

机译：1,4-二恶烷在298.15 K下在各种溶剂中的热力学函数

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摘要

The standard changes in enthalpy during the solvation of 1,4-dioxane in methanol, ethyl acetate, DMF, and acetonitrile were determined from calorimetric data and compared with the literature data for a series of solvents with different polarities. The standard changes in the Gibbs energy during the solvation of 1,4-dioxane in a wide series of solvents were calculated from the activity coefficients reported in the literature. The variation of the solvation functions of low-polar 1,4-dioxane in the series of solvents was found to be con-sistent with the enthalpy-entropy compensation rule. The results for 1,4-dioxane were compared with those for its open-chain analog and related large cyclic molecules. The electrostatic interactions of the solute with the solvents did not markedly affect the thermodynamic characteristics of ether in media with different polar-ities, but affected the interaction of the solute with the solvent more significantly. The solvation of the small ring of 1,4-dioxane in aprotic solvents was accompanied by a more significant exothermal effect than in the case of its open-chain analog. The conclusion was drawn that the enthalpies of the formation of hydrogen bonds between 1,4-dioxane and the associated water and chloroform molecules in solution were smaller in magnitude than the bonds of the similar open-chain polyether.
机译：从量热数据确定了1,4-二恶烷在甲醇，乙酸乙酯，DMF和乙腈中的溶剂化过程中焓的标准变化，并与一系列极性不同的溶剂的文献数据进行了比较。从文献报道的活度系数计算出在各种溶剂中1,4-二恶烷的溶剂化过程中吉布斯能量的标准变化。发现低极性1,4-二恶烷在一系列溶剂中的溶剂化功能变化与焓-熵补偿规律一致。将1,4-二恶烷的结果与其开链类似物和相关大环分子的结果进行了比较。溶质与溶剂的静电相互作用不会显着影响极性不同的介质中醚的热力学特性，但会更显着地影响溶质与溶剂的相互作用。 1,4-二恶烷小环在非质子传递溶剂中的溶剂化比其开链类似物具有更显着的放热效应。得出的结论是，溶液中1,4-二恶烷与相关的水和氯仿分子之间形成氢键的焓比类似的开链聚醚键小。

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