Isotope effects in electron spin resonance: the negative ion of cyclo-octatetraene-1-d

Abstract

Replacement of one hydrogen atom by deuterium in the negative ion of cyclo-octatetraene, makes no significant difference to the electron spin densities at the hydrogen nuclei. This result contrasts with a recent observation that mono-deuteration produces a measurable change in the spin distribution in the benzene negative ion. The difference between the two systems is interpreted in terms of the Jahn-Teller effect.