pKa Determination of Strongly Acidic C-H Acids Bearing a (Perfluoroalkyl)sulfonyl Group in Acetonitrile by Means of Voltammetric Reduction of Quinone

Akira KOTANI; Hikaru YANAI; Takashi MATSUMOTO; Hideki HAKAMATA

doi:10.5796/electrochemistry.20-65154

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CORRECTED PROOF

pK_a Determination of Strongly Acidic C-H Acids Bearing a (Perfluoroalkyl)sulfonyl Group in Acetonitrile by Means of Voltammetric Reduction of Quinone

Akira KOTANI , Hikaru YANAI, Takashi MATSUMOTO, Hideki HAKAMATA

著者情報

キーワード: pK_a, (perfluoroalkyl)sulfonyl Group, C-H Acid, Voltammetry

ジャーナルオープンアクセス早期公開
電子付録

論文ID: 20-65154

DOI https://doi.org/10.5796/electrochemistry.20-65154

この記事には本公開記事があります。

The final version of this article is now available: Vol. 89 (2021), No. 2 pp. 121-124

CORRECTED PROOF： 2021/02/03
UNCORRECTED PROOF： 2021/01/22
ACCEPTED MANUSCRIPT： 2021/01/13

詳細

抄録

A voltammetric method has been developed for the determination of the acid dissociation constant (pK_a) of (RfSO₂)₂CHR (Rf = perfluoroalkyl), which is a strongly acidic molecule that serves as an acid catalyst. In acetonitrile solution containing small quantity of the acid, the reduction peak potential of quinone caused by the acid shifted to a more positive side accompanied by an increase in the acidity of the acid. This relationship was in good agreement with an equation derived from the Nernst equation. The present finding has been successfully applied to the determination of the pK_a of the acids in acetonitrile with values ranging from 7 to 17.

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