Volumetric Properties of Glycine, l-Alanine, and l-Serine in Formamide鈥揥ater Mixtures at 298.15 K

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• 作者：Zhijie Kong ; Chunli Liu ; Li Jiang ; Junyong Mo ; Lin Ma
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2014
• 出版时间：August 14, 2014
• 年：2014
• 卷：59
• 期：8
• 页码：2595-2601
• 全文大小：246K
• ISSN：1520-5134

文摘

The density of glycine, l-alanine, and l-serine in formamide鈥搘ater mixtures was measured at 298.15 K and used to calculate the apparent molar volume V and limiting partial molar volume V掳 of the amino acids. Transfer partial molar volume 螖_trV掳 from water to formamide鈥搘ater mixtures and the volumetric interaction coefficients were also obtained to interpret the solute鈥搒olvent interaction. Values of 螖_trV掳 of the three amino acids were all positive and increased with increasing formamide concentration in the mixtures, in the order of l-alanine < glycine < l-serine, which was consistent with the cosphere overlap model. The interaction of formamide molecules decreased its structural-breaking effect and consequent interaction with amino acids, leading to negative triplet interaction coefficients.