THE BEHAVIOR OF SULFONIC ACIDS IN NON-AQEOUS SOLVENTS

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  • Nango Mamoru
    Department of Applied Chemistry, College of Engineering, University of Osaka Prefecture
  • Katayama Akira
    Department of Applied Chemistry, College of Engineering, University of Osaka Prefecture
  • Kuroki Nobuhiko
    Department of Applied Chemistry, College of Engineering, University of Osaka Prefecture

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Other Title
  • 非水溶媒中でのスルホン酸類の挙動
  • ヒミズヨウバイ チュウ デ ノ スルホン サンルイ ノ キョドウ

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Description

The position of the -OH proton resonance of methanesulfonic acid has been measured at various dilution in several solvents containing -OH group, such as water, methanol and ethyleneglycol. In all solvents studied, a single resonance line was observed. The proton resonance of the -OH group moves first to low field and to high field with increasing dilution. From the dilution curves it was found that in water, methanol and ethyleneglycol this movement of the -OH signal to high field commences at the following concentrations (more ratio of the sulfonic acid to the solvents); 3:1, 2:1 and 4:1. This suggests that sulfonic acid forms 3:1, 2:1 and 4:1 complexes with water, methanol and ethyleneglycol where hydrogen bonds play major roles.<br>The chemical shifts for the ionizable proton in aqueous, methanol and ethyleneglycol solutions of methanesulfonic acid and benzenesulfonic acid have been measured at 34°C. In all cases studied, a single resonance line was observed and the proton chemical schifts dependedd upon the concentration of the acids. From the observed proton chemical shifts relative to the pure solvents, the degrees of ionization of the sulfonic acids have been calculated. The ionization constants estimated in the solvents were in the following order; water ≥ ethyleneglycol > methanol.

Journal

  • Sen'i Gakkaishi

    Sen'i Gakkaishi 29 (5), T216-T219, 1973

    The Society of Fiber Science and Technology, Japan

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