Solvent effects in the electron spin resonance spectrum of fluorenone ketyl

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Abstract
The electron spin resonance spectrum of the fluorenone anion has been measured in mixtures of an alcohol with dimethylformamide. The main dependence of the proton coupling constants on the concentration of alcohol may be understood in terms of an equilibrium between the solvated ketyl and a ketyl-alcohol hydrogen-bonded complex, but a secondary solvent effect must be postulated to account completely for the variation. The changes in spin density in the ketyl on formation of the ketyl-alcohol complex cannot be understood using simple Hückel molecular-orbital theory.