Journal of the Mexican Chemical Society
versão impressa ISSN 1870-249X
FRONTANA, Carlos e GONZALEZ, Ignacio. Revisiting the Effects of the Molecular Structure in the Kinetics of Electron transfer of Quinones: Kinetic Differences in Structural Isomers. J. Mex. Chem. Soc [online]. 2008, vol.52, n.1, pp. 11-18. ISSN 1870-249X.
The effect of 2,5 and 2,6 disubstitution (R = CH3, Cl, C(CH3)3) for 1,4-benzoquinones, in the reorganization energy (λ) for the first electron uptake process was analyzed in acetonitrile solution. Data obtained by cyclic voltammetry suggested differences in λ for each type of disubstitution analyzed. These differences have important consequences in the stability and structure of the electro-generated benzosemiquinone species, which was verified by performing in-situ spectroelectrochemical-ESR (Electron Spin Resonance) experiments of each disubstituted semiquinone.
Palavras-chave : Quinone; substituent effect; cyclic voltammetry; inner reorganization energy; ESR.