Enthalpic Interaction of Amino Acids with 2-Chloroethanol in Aqueous Solutions at 298.15 K |
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Authors: | Li Yu Xin-gen Hu Rui-sen Lin Gui-ying Xu |
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Institution: | (1) Ministry of Education State, Key Lab for Colloid and Interface Chemistry (Shandong University), Jinan, 250100, PR China;(2) Department of Chemistry, Zhejiang University, Hangzhou, 310027, PR China;(3) Department of Chemistry, Wenzhou Normal College, Wenzhou, 325000, PR China |
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Abstract: | The enthalpies of mixing have been determined for five kinds of aqueous amino acids solutions (glycine, L-alanine, L-valine, L-serine, and L-proline) with 2-chloroethanol by an LKB-2277 Bio Activity Monitor at 298.15 K. In addition, the enthalpies of dilution at 298.15 K of aqueous solutions containing the five kinds of amino acids and 2-chloroethanol have been obtained. The heterotactic enthalpic pairwise interaction coefficients of the virial expansion of excess enthalpy were evaluated and interpreted from the point of view of solute–solute interactions. In comparison with ethanol, 2-chloroethanol shows a stronger exothermic interaction with amino acids because of its hydrophilic Cl atom and a more acidic –OH group. Using the additivity groups concept by Savage and Wood (SWAG), contributions of each of functional group of the amino acids and ethanol and 2-chloroethanol have been estimated. |
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Keywords: | Enthalpy of dilution enthalpy of mixing amino acids 2-chloroethanol heterotactic enthalpic interaction solute– solute interaction SWAG approach |
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