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Assignment of hyperfine splittings in ENDOR-in-solution spectra by means of coherence effects

Dinse, K.-P ; Biehl, R ; Möbius, K ; Plato, M

Journal of Magnetic Resonance (1969), 1972, Vol.6(3), pp.444-452

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  • Title:
    Assignment of hyperfine splittings in ENDOR-in-solution spectra by means of coherence effects
  • Author: Dinse, K.-P ; Biehl, R ; Möbius, K ; Plato, M
  • Description: The nuclear-nuclear coherence effect in electron-nuclear double resonance (ENDOR) experiments is studied in the case of the perinaphthenyl radical in solution. It is shown that in certain cases this coherence effect can be used to determine the number of protons contributing to an ENDOR line. In the case of ion-radicals it turns out that NMR fields as high as 35 gauss amplitude (rotating frame) are necessary to produce significant effects. By this method it was possible to determine all the 12 proton hyperfine splitting constants for the ion-radicals 1-phenylnaphthalene and 2-phenylnaphthalene. They are interpreted in terms of π-electron theories of Hückel, McLachlan, and Amos-Snyder. The large discrepancies between experimental and calculated splitting constants indicate that π-σ separability is no longer permissible for these nonplanar molecules.
  • Is Part Of: Journal of Magnetic Resonance (1969), 1972, Vol.6(3), pp.444-452
  • Identifier: ISSN: 0022-2364 ; DOI: 10.1016/0022-2364(72)90120-5
  • Language: English
  • Source: ScienceDirect (Elsevier B.V.)

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