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Electron spin resonance spectroscopy of free radicals

✍ Scribed by Shirley A. Fairhurst; Leslie H. Sutcliffe; Keith F. Preston; Arthur J. Banister; Andrew S. Partington; Jeremy M. Rawson; Jack Passmore; Melbourne J. Schriver

Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
301 KB
Volume
31
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

Solution and powder ESR spectra of the 4‐trifluoromethyl‐1,2,3,5‐dithiadiazolyl and 4‐pentafluorophenyl‐1,2,3,5‐dithiadiazolyl free radicals were analysed. Comparison of the ESR parameters with those obtained for the protonated equivalents shows that fluorination produces a drift of unpaired electron spin density away from the nitrogen 2p~x~ orbitals towards sulphur 3p~x~ orbitals (x is the direction perpendicular to the heterocyclic ring), consistent with an increase in electronegativity of the substituent. The fluorinated radicals dimerize more readily than their protonated counterparts.

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