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Isotope effect on the J-T distortion of partially deuteriated benzene cation radicals: An experimental EPR and theoretical DFT study
Natl. Inst. Adv. Indust. Sci. T., Anagahora 2266-98, Moriyama-ku, Nagoya 463-8560, Japan.
Natl. Inst. Adv. Indust. Sci. T., Anagahora 2266-98, Moriyama-ku, Nagoya 463-8560, Japan.
Department of Quantum Chemistry, Uppsala University, Box 518, S-751 20, Uppsala, Sweden.
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Chemical Physics .
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2004 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, Vol. 6, no 8, 1658-1665 p.Article in journal (Refereed) Published
Abstract [en]

D/H isotope-substitution effects on the Jahn-Teller (J-T) distortion of cation radicals of partially deuteriated benzenes, benzene-d5, benzene-1,2,4,5-d4, benzene-1,4-d2, and benzene-1,3,5-d3, were investigated by electron spin resonance (EPR) using frozen haloalkanes and porous silicas as matrices. Quantum-chemical calculations using the density functional theory (DFT) method were also performed. The way of distortion of the cation radicals of selectively deuteriated benzenes is unique relative to the deuteriation sites in all the matrices used. The ground state of the distorted cation is 2B 2g of D2h symmetry, regardless of the way of isotope labeling. The undeuteriated C-H bonds occupy the specific positions in the distorted form where the higher spin density appears, in agreement with the result of theoretical calculations. The role of the matrix to stabilize the distorted form is also discussed.

Place, publisher, year, edition, pages
2004. Vol. 6, no 8, 1658-1665 p.
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-45739DOI: 10.1039/b315835gOAI: diva2:266635
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2011-01-12

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