E.s.r. and 1H-ENDOR/TRIPLE resonance experiments on ion pairs in solution formed by 4,4′-dicyanobenzophenone ketyl and a few alkali-metal cations (7Li, 23Na, 39K and 133Cs) are reported. Spectral data for the electrolytically generated ketyl (tetra-n-butylammonium counterion) are also given. The 13C hyperfine interactions (carbonyl group) as a function of the counterions have been measured by e.s.r. techniques on the labelled radical. All h.f.s. data and their temperature variations are interpreted in the frame of an adequate ion-pair model and the conclusions are supported by MO calculations (McLachlan, INDO and MINDO/3).
ESR and ENDOR Investigation of the Ion Pairs of 4-4’-Dicyanobenzophenone Ketyl with Alkali-metal Cations / M. Barzaghi, A. Gamba, C. Oliva, M. Branca, A. Saba. - 84:10(1988), pp. 3279-3291. [10.1039/F19888403279]
ESR and ENDOR Investigation of the Ion Pairs of 4-4’-Dicyanobenzophenone Ketyl with Alkali-metal Cations
C. Oliva;
1988
Abstract
E.s.r. and 1H-ENDOR/TRIPLE resonance experiments on ion pairs in solution formed by 4,4′-dicyanobenzophenone ketyl and a few alkali-metal cations (7Li, 23Na, 39K and 133Cs) are reported. Spectral data for the electrolytically generated ketyl (tetra-n-butylammonium counterion) are also given. The 13C hyperfine interactions (carbonyl group) as a function of the counterions have been measured by e.s.r. techniques on the labelled radical. All h.f.s. data and their temperature variations are interpreted in the frame of an adequate ion-pair model and the conclusions are supported by MO calculations (McLachlan, INDO and MINDO/3).
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