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Intermolecular Hydrogen Transfer in Isobutane Hydrate

Author

Listed:
  • Naohiro Kobayashi

    (Division of Chemical Engineering, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan)

  • Takashi Minami

    (Division of Chemical Engineering, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan)

  • Atsushi Tani

    (Department of Earth and Space Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan)

  • Mikio Nakagoshi

    (Division of Chemical Engineering, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan)

  • Takeshi Sugahara

    (Division of Chemical Engineering, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan)

  • Kei Takeya

    (Department of Electrical and Electronic Engineering and Information Engineering, Graduate School of Engineering, Nagoya University, Furo, Chikusa-ku, Nagoya, Aichi 464-8603, Japan)

  • Kazunari Ohgaki

    (Division of Chemical Engineering, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan)

Abstract

Electron spin resonance (ESR) spectra of butyl radicals induced with γ-ray irradiation in the simple isobutane (2-methylpropane) hydrate (prepared with deuterated water) were investigated. Isothermal annealing results of the γ-ray-irradiated isobutane hydrate reveal that the isobutyl radical in a large cage withdraws a hydrogen atom from the isobutane molecule through shared hexagonal-faces of adjacent large cages. During this “hydrogen picking” process, the isobutyl radical is apparently transformed into a tert -butyl radical, while the sum of isobutyl and tert -butyl radicals remains constant. The apparent transformation from isobutyl to tert -butyl radicals is an irreversible first-order reaction and the activation energy was estimated to be 35 ± 3 kJ/mol, which was in agreement with the activation energy (39 ± 5 kJ/mol) of hydrogen picking in the γ-ray-irradiated propane hydrate with deuterated water.

Suggested Citation

  • Naohiro Kobayashi & Takashi Minami & Atsushi Tani & Mikio Nakagoshi & Takeshi Sugahara & Kei Takeya & Kazunari Ohgaki, 2012. "Intermolecular Hydrogen Transfer in Isobutane Hydrate," Energies, MDPI, vol. 5(6), pages 1-8, May.
    • Handle: RePEc:gam:jeners:v:5:y:2012:i:6:p:1705-1712:d:17984
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