Abstract
The densities of l-alanine and l-serine in aqueous solutions of N,N-dimethylformamide (DMF) have been measured at 298.15 K with an Anton Paar Model 55 densimeter. Apparent molar volumes \( (V_{\phi } ) \), standard partial molar volumes \( (V_{\phi }^{0} ) \), standard partial molar volumes of transfer \( (\Updelta_{\text{tr}} V_{\phi }^{0} ) \) and hydration numbers have been determined for the amino acids. The \( \Updelta_{\text{tr}} V_{\phi }^{0} \) values of l-serine are positive which suggest that hydrophilic–hydrophilic interactions between l-serine and DMF are predominant. The –CH3 group of l-alanine has much more influence on the volumetric properties and the \( \Updelta_{\text{tr}} V_{\phi }^{0} \) have smaller negative values. The results have been interpreted in terms of the cosphere overlap model.
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This work was supported by the Science-Technology Foundation for Middle-Aged and Young Scientists of Shandong Province (BS2011SF026).
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Liu, C., Zhou, L., Ma, L. et al. Volumetric Properties of l-Alanine and l-Serine in Aqueous N,N-Dimethylformamide Solutions at 298.15 K. J Solution Chem 42, 1572–1579 (2013). https://doi.org/10.1007/s10953-013-0060-4
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DOI: https://doi.org/10.1007/s10953-013-0060-4