The polarographic reduction of acids in pyridine. The cause of the differences in half-wave potentials with various supporting electrolytes.
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概要
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The polarographic reductions of acetic, benzoic, <I>p</I>-toluenesulfonic, and perchloric acids have been examined in pyridine solutions with tetrabutylammonium, tetraethylammonium, sodium, and lithium perchlorate as the supporting electrolytes. The difference in the half-wave potentials of the acids was explained in terms of the difference in the degree of interaction between the pyridinium ion and the conjugate bases (e.g., CH<SUB>3</SUB>COO<SUP>−</SUP>) made of the acids. The alkali-metal ions interact with the acetate or benzoate ion to form RCOO<SUP>−</SUP>(M<SUP>+</SUP>)<SUB>2</SUB> (M=Li and Na). The formation constants of RCOO<SUP>−</SUP>(M<SUP>+</SUP>)<SUB>2</SUB> were evaluated by means of the positive shift in the half-wave potential of the pyridinium ion in the presence of a large excess of the alkali metal ions. Substituted acetic and benzoic acids and phenols were also examined so as to ascertain the effect of the substituent groups.
- 公益社団法人 日本化学会の論文
著者
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Imai Yoshihiko
Department Of Applied Physics University Of Tokyo
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Hojo Masashi
Department Of Chemistry Faculty Of Science Kochi University
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Nishikawa Kazukiyo
Department of Chemistry, Faculty of Science, Kochi University
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Akita Yoshihiro
Department of Chemistry, Faculty of Science, Kochi University
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