Abstract: | One-Electron Redox Reactions of Octaphenyl4]radialene: Generation and ESR/ENDOR Characterisation of Its Radical Anion and Radical Cation The cyclovoltammograms of octaphenyl4]radialene in DMF or THF at room temperature disclose each two quasireversible reduction and oxidation potentials at ?1.4 V/?1.7 V and +0.7 V/+0.9 V. Accordingly, both the radical anion and the radical cation can be generated: Ph8C by K metal mirror reduction of a 2.2.2]cryptand containing THF solution, and Ph8C by TI3⊕(?OOCCF3)3 oxidation in H2CCl2. Their ESR/ENDOR and General Triple spectra differ considerably in the number of resolved 1H couplings (M·?: 5 and M·⊕: 3) as well as in their spectral widths (M·?: a1H 0.090 to 0.017 mT; M·⊕: a1H 0.066 to 0.023 mT) suggesting different changes in the D2d structure of the neutral molecule on electron uptake or extrusion. |