The electron spin resonance spectrum of the 2,4,6-triphenylpyryl radical

Abstract
A high resolution E.S.R. spectrum of the 2,4,6-triphenylpyryl radical is presented. By investigating some deuterium substituted derivatives and with the help of simulated spectra, all hyperfine coupling constants were derived. Also an attempt to rationalize the electron-proton coupling constants in terms of twisting angles of the phenyl rings out of the heterocyclic plane was made.

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