The electron spin resonance spectra of the ion pairs of ortho-tetrachloro benzosemiquinone with the whole series of the alkali metals have been recorded in different solvents in a range of temperatures. 13C hyperfine splittings from nuclei in all the positions in natural isotopic abundance were measured; they are discussed together with the g factor and the alkali metal coupling constants. The sign of the coupling constants is obtained from the analysis of the linewidths of the different hyperfine components. The experimental data are consistent with a structure of the ion pairs with the metal ion chelated by the two oxygens of the semiquinone molecule. With Rb and Cs in tetrahydrofuran a different structure is proposed with the metal ion bonded to only one oxygen. © 1976.
ESR investigation of o-chloranil alkali metal ion pairs
BRUSTOLON, MARINA ROSA;
1976
Abstract
The electron spin resonance spectra of the ion pairs of ortho-tetrachloro benzosemiquinone with the whole series of the alkali metals have been recorded in different solvents in a range of temperatures. 13C hyperfine splittings from nuclei in all the positions in natural isotopic abundance were measured; they are discussed together with the g factor and the alkali metal coupling constants. The sign of the coupling constants is obtained from the analysis of the linewidths of the different hyperfine components. The experimental data are consistent with a structure of the ion pairs with the metal ion chelated by the two oxygens of the semiquinone molecule. With Rb and Cs in tetrahydrofuran a different structure is proposed with the metal ion bonded to only one oxygen. © 1976.
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