Abstract
Spin polarised positive muons substituted for a hydrogen nucleus in organic radicals are used as spin labels to sense reorientational motion of the radicals in orienting environments. The effect of uniaxial motion on the spectrum of the muonated cyclohexadienyl radical in a benzene single crystal and of its hexamethyl derivative in polycrystalline hexamethylbenzene is demonstrated. Isotopic spectra for cyclohexadienyl radicals adsorbed on SiO2 are explained by translational diffusion around the 7 nm grain. The potential of the technique to study transient radical intermediates of processes in heterogeneous catalysis is discussed.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
E. Roduner,The Positive Muon as a Probe in Free Radical Chemistry. Potential and Limitations of the μSR Techniques. Lecture Notes in Chemistry, Vol. 49 (Springer, Heidelberg, 1988).
A. Carrington and A. D. McLachlan,Introduction to Magnetic Resonance (Harper, New York, 1967).
M. Brustolon and A. L. Maniero, J. Mag. Res. 54 (1983) 190.
I. D. Reid and E. Roduner, Structural Chemistry, in press.
E. Roduner, Chem. Phys. Letters, 81 (1981) 191.
K. Eiben and R. H. Schuler, J. Chem. Phys. 62 (1975) 3093.
M. Heming, E. Roduner, B. D. Patterson, W. Odermatt, J. W. Schneider, H. Baumeler, H. Keller and I. M. Savić. Chem. Phys. Lett. 128 (1986) 100.
R. F. Kiefl, Hyp. Int. 32 (1986) 707.
E. Roduner, Chimia 43 (1989) 86.
E. Roduner and H. Fischer, Chem. Phys. 54 (1981) 261.
M. Heming, E. Roduner, I. D. Reid, P. W. F. Louwrier, J. W. Schneider, H. Keller, W. Odermatt, B. D. Patterson, H. Simmler, B. Pümpin and I. M. Savić, Chem. Phys. 129 (1989) 335.
I. D. Reid, T. Azuma and E. Roduner, Hyp. Int. 65 (1990) 879.
E. Roduner, I. D. Reid, M. Riccò and R. De Renzi, Ber. Bunsenges. Phys. Chem. 93 (1989) 1194.
M. Riccò, and R. De Renzi, Hyp. Int. 65 (1990) 873.
M. Mehring, in:NMR, Basic Principles and Progress, eds., P. Diehl, E. Fluck and R. Kosfeld, Vol. 11 (Springer, Heidelberg, 1976) p. 39.
U. Haeberlen and G. Maier, Z. Naturforsch. A 22 (1967) 1236.
E. G. Cox, D. W. J. Cruickshank and J. A. S. Smith, Proc. Royal Soc. London, Ser. A 247 (1958) 1.
T. Gullion and M. S. Conradi, Phys. Rev. B 32 (1985) 7076.
F. Fujara, W. Petry, W. Schnauss and H. Sillescu, J. Chem. Phys. 89 (1988) 1801.
H. Pfeiffer, in:NMR, Basic Principles and Progress, eds. P. Diehl, E. Fluck and R. Kosfeld, Vol. 7 (Springer, Heidelberg, 1972) p. 105.
I. D. Reid, T. Azuma and E. Roduner, Nature, 345 (1990) 328.
B. Boddenberg, R. Haul and G. Oppermann, Naturwissenschaften 56 (1969) 635.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Roduner, E. Radical reorientation dynamics studied by positive-muon avoided level crossing resonance. Hyperfine Interact 65, 857–871 (1991). https://doi.org/10.1007/BF02397738
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02397738