Hydrogen Bonding Interactions of Carboxylic Acids with <I>N</I>,<I>N</I>-Dimethylacetamide and Pyrazine as Studied by Means of NMR Dilution Shifts

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概要

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• The NMR dilution shifts of OH proton in several carboxylic acids have been studied for mixtures with <I>N</I>,<I>N</I>-dimethylacetamide (DMA) or pyrazine. The acids treated were acetic, propionic isobutyric, and trifluoroacetic acids. The dilution shifts curve of OH proton in each acid–DMA system showed a characteristic ν-type curve with the minimum value at 0.65–0.75 mol fraction of the acid. The curve for the isobutyric acid-pyrazine system was linear below 0.45 mol fraction of the acid, taking the minimum at 0.75 mol fraction. These curves were explained by assuming the formation of both 1: 1 and 2 (acids): 1(base) complexes in the chemical equilibrium. The formation constants of the complexes and the shifts of OH proton in the 2: 1 complex were estimated for each system. Liability of the complex formation and the structure possible for the 2: 1 complex were discussed.

• 公益社団法人 日本化学会の論文

著者

• Fujiwara Hideaki

  Chemical Research Institute Of Non-aqueous Solutions

• Ikenoue Tsuneo

  Chemical Research Institute Of Non-aqueous Solutions

• Ikenoue Tsuneo

  Chemical Research Institute of Non-Aqueous Solutions, Tohoku University

• Yoshida Nobuyuki

  Chemical Research Institute of Non-Aqueous Solutions, Tohoku University

• Fujiwara Hideaki

  Chemical Research Institute of Non-Aqueous Solutions, Tohoku University

関連論文

• A Spectroscopic Study of Pyrazine in Mixed Acidic Solvents
• A time-resolved ESR study on the photochemical reduction of nitrobenzene derivatives in alcoholic solution.
• Hydrogen Bonding Interactions of Carboxylic Acids with N,N-Dimethylacetamide and Pyrazine as Studied by Means of NMR Dilution Shifts

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