The Photochemically Produced Ketyl of Perfluorobenzophenone: Electron Spin Resonance Studies of Solvent Effects

Abstract

The ketyl radical is formed when solutions of perfluorobe~~zopheno~~e are photolyzed with 11.v. light. The radical was identified by electron spin resonance (e.s.r.) studies of the effects of solvent, tenlperati~re, chemical exchange, and deuteration on the spectra. Solvent ~n i x t~~r e s of cyclohexane and ethanol gave spectra which were very sensitive to the mole fraction of alcohol in the range 0-1%. An equilibriun~ constant for solvent nlolecule exchange has been deduced.Le radical cttyle est produit lorsqi~e des solutions de perfluorobenzophtnone sont photolystes avec de la lumiere ultraviolette. Le radical a pi1 Ctre identifit grice A la rtsonance de spin electroniqi~e inlpliquant des effets de solvant, de temptrature, d'echange chimique et de de~~teralion. Des melanges de solvant, cyclohexane-ethanol, ont conduit A des spectres ou I'on a denote ilne ires graude sensibilite vis-a-vis la fraction nlolaire d'alcool dans I'intervalle allant de 0-1%. De meme, on a dtduit ilne constante d'tquilibre pour I'tchange solvant-molecule.[Traduit par le journal]Can.