Author： Hendriks B.M.P. Canters G.W. Corvaja C. Boer J.W.M. Boer E.
Publisher： Taylor & Francis Ltd
ISSN： 1362-3028
Source： Molecular Physics, Vol.20, Iss.2, 1971-02, pp. : 193-209
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Abstract
Nuclear magnetic resonance has been carried out on all nuclei with nonzero magnetic moments present in the alkali ion pairs of deuterated and nondeuterated naphthalene radical anion in 1,2-dimethoxyethane. Both the sign and magnitude of the hyperfine splitting constant (h.f.s.c.) were measured, the alkali h.f.s.c. being studied as a function of the temperature. The Li and Na h.f.s.c. appear to be positive, those of Rb and Cs are negative, whereas that of K changes sign with temperature. The proton and deuterium linewidths were studied as a function of the concentration and were found to vary linearly with the reciprocal of the concentration, pointing to the predominance of the Fermi contact interaction. An analysis of the alkali linewidth is given in terms of the intramolecular relaxation processes. Especially in cases where two isotopes could be studied, i.e. ( 1 H, 2 D), ( 6 Li, 7 Li) and ( 85 Rb, 87 Rb), a quantitative interpretation is presented.
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