Electron affinities of SO2 and nitrobenzene

Publisher Website
Google Scholar
Abstract
Several ion–molecule reactions have been observed which indicate that the electron affinities of SO2 and nitrobenzene are far greater than the currently accepted values. The reactions were studied by pulsed ion cyclotron resonance (ICR) spectrometry using a trapped ion analyzer cell to store the ions for several hundred ms. Reaction pathways were confirmed by ion cyclotron double resonance and by varying the pressures of the neutral reactants. The relative electron affinity of nitrobenzene and SO2 was determined by measuring the equilibrium constant for the reaction C6H5NO−2+SO2=SO2−+C6H5NO2, ΔG°=−3.0±0.2 kcal/mol. Pulsed ICR bracketing experiments support the following electron affinity values: E.A.(SO2)=2.2±0.1 eV and E.A.(C6H5NO2)=2.1±0.1 eV.