On the ratio of zwitterion form to uncharged form of glycine at equilibrium in various aqueous media.
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概要
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The ratios of the zwitterion form to the uncharged form of glycine, <I>K</I><SUB>D</SUB>=[NH<SUB>3</SUB><SUP>+</SUP>CH<SUB>2</SUB>COO<SUP>−</SUP>]/[NH<SUB>2</SUB>CH<SUB>2</SUB>COOH], were determined in mixtures of water with methanol, ethanol, <I>t</I>-butyl alcohol, dimethyl sulfoxide, acetonitrile, 1,4-dioxane, <I>N</I>,<I>N</I>-dimethylformamide, and tetrahydrofuran. The value of In <I>K</I><SUB>D</SUB> decreases and, therefore, Δ<I>G</I><SUB>298</SUB><SUP>°</SUP> increases, with the increase in the mole fractions of the organic solvents. The plots of Δ<I>G</I><SUP>°</SUP> <I>vs.</I> reciprocal of the dielectric constants of the alcoholic mixtures are simply linear indifferent to the kind of alcohols, indicating that this relation obeys the Scatchard equation and that the free energy change of the process of the intramolecular protonation in glycine is controlled mainly by electrostatic interaction, especially by the entropy change associated with the preferential solvation around the charged amino and carboxyl groups.
- 公益社団法人 日本化学会の論文
著者
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Nakamura Mariko
Department of Biology, School of Education, Waseda University
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Wada Goro
Department of Chemistry, Faculty of Science, Nara Women s University
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Okina Mitsuko
Department of Chemistry, Nara Women's University
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Tamura Eiko
Department of Chemistry, Nara Women's University
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Tamura Eiko
Department of Chemistry, Nara Women's University
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