Interaction between pyrazine and halomethanes. I. Complex formation between pyrazine and halomethanes at room temperature.

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概要

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• The absorption spectrum of pyrazine has been studied at room temperature in various mixed solvents of cyclohexane and halomethanes such as carbon tetrachloride, chloroform and dichloromethane. With increasing concentration of halomethane, the singlet-singlet (S-S) and singlet-triplet (S-T) n→π<SUP>*</SUP> absorptions decrease in intensity and become structureless, whereas the S-S π→π<SUP>*</SUP> absorption remains essentially unchanged. The observations are attributed to the complex formation between pyrazine and halomethanes involving the non-bonding electrons in pyrazine. From the concentration and temperature dependences of the n→π<SUP>*</SUP> absorption spectra, the equilibrium constants, enthalpy and entropy changes have been obtained for the complex formation in all the systems studied. The equilibrium constants obtained from the S-S and S-T n→π<SUP>*</SUP> absorptions are in good agreement with each other.

• 公益社団法人 日本化学会の論文

著者

• SHIMADA Ryoichi

  Department of Electronics, Faculty of Technology, Fukuoka Institute of Technology

• Kanda Yoshiya

  Department of Chemistry, Faculty of Science, Kyushu University

• Gondo Yasuhiko

  Department of Chemistry, Faculty of Science, Kyushu University

• Kuroi Tatsuaki

  Chemical Institute, Faculty of Education, Oita University

• Kuwabara Masamichi

  Department of Chemistry, Faculty of Science, Kyushu University

• Shimada Ryoichi

  Department of Chemistry, Faculty of Science, Kyushu University

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