Hyperfine anisotropy and crystal field effects in Mu adducts to naphthalene
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Muonated cyclohexadienyl type radicals have been studied in a naphthalene single crystal using the standard transverse-field μSR technique. Muonium addition occurs at both the α and the β positions. Because of the multiplicity and weakness of the lines in the Fourier spectrum, special techniques were developed to allow the signals to be found and identified. The isotropic hyperfine coupling constants show large shifts from the solution values, with significant anisotropy in the hyperfine tensors. The results for the α radicals are similar to those observed for protonated α-hydronaphthyl radicals, but isotope effects are evident. Based on the hyperfine tensor directions and geometrical considerations, each radical has been assigned to a specific muon site within the crystal.
KeywordsNaphthalene Crystal Field Isotope Effect Fourier Spectrum Hyperfine Coupling
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- E. Roduner,The Positive Muon as a Probe in Free Radical Chemistry, Lecture Notes in Chemistry 49 (Springer-Verlag, Berlin, 1988).Google Scholar
- E. Roduner, Progr. Reaction Kinetics 14 (1986) 1.Google Scholar
- U.R. Böhme, Ph.D. thesis, Universität Stuttgart, 1973 (unpublished).Google Scholar
- L.D. Kispert, in:Multiple Electron Resonance Spectroscopy, eds. M.M. Dorio and J.H. Freed (Plenum Press, New York, 1979) p. 261.Google Scholar
- I.D. Reid and E. Roduner, Structural Chemistry, in press.Google Scholar
- M. Brustolon and A.L. Maniero, J. Magn. Reson. 54 (1983) 190.Google Scholar
- E. Roduner and I.D. Reid, Israel J. Chem. 29 (1989) 3.Google Scholar