Interactions of Some Amino Acids with Aqueous N,N-Dimethylacetamide Solutions at 298.15 and 308.15 K: A Volumetric Approach |
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Authors: | Chunli Liu Li Zhou Ruisen Lin |
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Institution: | (1) Department of Chemistry, Zhejiang University, Hangzhou, 310027, People’s Republic of China;(2) Department of Chemistry and Chemistry Engineering, Zao Zhuang University, Zao Zhuang, 277160, People’s Republic of China |
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Abstract: | The apparent molar volumes, V
φ
, of glycine, L-alanine and L-serine were obtained in aqueous 0 to ∼4 mol⋅kg−1 N,N-dimethylacetamide (DMA) solutions from density measurements at 298.15 and 308.15 K. The standard partial molar volume,
V
φ
o, and standard partial molar volumes of transfer, Δtr
V
φ
o, were determined for these amino acids. It has been shown that hydrophilic-hydrophilic interactions between charged groups
of the amino acids and the —CON= group of DMA are predominant in the case of glycine and L-serine, but for L-alanine the interactions
between its side group (—CH3) and DMA are predominant. An increase in temperature increases the standard partial molar volumes but decreases the transfer
volumes of the amino acids. The results have been interpreted in terms of cosphere overlap model. |
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Keywords: | Amino acids DMA Standard partial molar volume Hydration number |
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