Contrasting free energies of electron transfer from [6] and [8]annulenes to their perdeuteriated-per-13C analogues

Article abstract of DOI:10.1016/S0040-4039(00)97011-4

EPR analyis shows that the equilibrium isotope effect upon the equilibrium constant for electron transfer between isotopic isomers is much larger in [6]annulene (i.e. C₆H₆-·+¹³C₆D₆ = C₆H₆ + ¹³C₆D₆-·) than in the [8]annulene systems (i.e. C₈H₈-· + ¹³C₈D₈ = C₈H₈ + ¹³C₈D₈-·). This is due to the effects of aromaticity.