A Spectroscopic Study of Pyrazine in Mixed Acidic Solvents

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概要

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• Absorption Spectrum of pyrazine was examined in mixed solvents of trifluoroacetic acid-hexane (I), trifluoroacetic acid-water (II), isobutyric acid-hexane (III), and isopropyl alcohol-hexane (IV). Basicity constant pK_<BH^+> of pyrazine was determined to be 0.6 in the mixture II, whereas the determination of pK_<BH_2^<2+>> was unsuccessful, Spectral data showed no discernible amount of protonated species in the mixtures III and IV. The concentration dependence of the absorption coefficient of a n-π^* transition in the mixture III can be interpreted by assuming that pyrazine forms two hydrogen bonds with two isobutyric acid molecules.

• 東北大学の論文

著者

• Fujiwara Hideaki

  Chemical Research Institute Of Non-aqueous Solutions

• Ikenoue Tsuneo

  Chemical Research Institute Of Non-aqueous Solutions

関連論文

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