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Cage effect on stability and molecular dynamics of [(CH3)(3)N](center dot+) and [(CH3)(3)NCH2](center dot+) generated in gamma-irradiated zeolites
Hiroshima Univ, Grad Sch Engn, Dept Appl Chem, Higashihiroshima 7398527, Japan Inst Nucl Chem & Technol, Dept Radiat Chem & Technol, PL-03195 Warsaw, Poland Linkoping Univ, Dept Phys & Measurement Technol, Chem Phys Lab, S-58183 Linkoping, Sweden.
Hiroshima Univ, Grad Sch Engn, Dept Appl Chem, Higashihiroshima 7398527, Japan Inst Nucl Chem & Technol, Dept Radiat Chem & Technol, PL-03195 Warsaw, Poland Linkoping Univ, Dept Phys & Measurement Technol, Chem Phys Lab, S-58183 Linkoping, Sweden.
Hiroshima Univ, Grad Sch Engn, Dept Appl Chem, Higashihiroshima 7398527, Japan Inst Nucl Chem & Technol, Dept Radiat Chem & Technol, PL-03195 Warsaw, Poland Linkoping Univ, Dept Phys & Measurement Technol, Chem Phys Lab, S-58183 Linkoping, Sweden.
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Chemical Physics .
2001 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 3, no 17, 3532-3535 p.Article in journal (Refereed) Published
Abstract [en]

An EPR study was carried out to elucidate the zeolite cage effect on the stability and molecular dynamics of [(CH3)(3)N](.+) and [(CH3)(3)NCH2](.+) radical cations generated in gamma -irradiated Al-offretite, SAPO-37 and SAPO-42, which contained (CH3)(4)N+ ions as organic template. The [(CH3)(3)N](.+) radical cation was stable at room temperature when it was generated in relatively small size cages such as the sodalite cages of SAPO-37 and the beta -cages of SAPO-42. On the other hand, the [(CH3)(3)NCH2](.+) radical cation was stable not only in the sodalite cages of SAPO-37, but also in relatively large cages such as gmelinite cages or the main channels of Al-offretite and the alpha -cages of SAPO-42. Strongly temperature dependent EPR spectra were observed for the [(CH3)(3)NCH2](.+) radical cation stabilized in Al-offretite and SAPO-42. They were successfully analyzed by a spectral simulation method assuming a three-site exchange for the methyl protons. The evaluated exchange rates were in the order SAPO-37 (sodalite cages) < Al-offretite (gmelinite cages or main channels) < SAPO-42 (alpha -cages) in the temperature range 110-300 K.

Place, publisher, year, edition, pages
2001. Vol. 3, no 17, 3532-3535 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-49153OAI: oai:DiVA.org:liu-49153DiVA: diva2:270049
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-12

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