Electron paramagnetic resonance, ENDOR and TRIPLE resonance study of methyl-substituted benzoquinol radical cations

Autor:	Jorma Eloranta, Reijo Mäkelä, Mikko Vuolle
Rok vydání:	1992
Předmět:	Coupling constant chemistry.chemical_compound Hydroquinone Chemistry law Radical Physical and Theoretical Chemistry Resonance (chemistry) Benzoquinol Photochemistry Electron paramagnetic resonance Spectral line law.invention
Zdroj:	J. Chem. Soc., Faraday Trans.. 88:2173-2178
ISSN:	1364-5455 0956-5000
DOI:	10.1039/ft9928802173
Popis:	EPR and ENDOR spectra have been recorded for hydroquinone, methylhydroquinone, 2,3-dimethylhydroquinone, 2,5-dimethylhydroquinone, 2,6-dimethylhydroquinone, 2,3,5-trimethylhydroquinone and tetramethylhydroquinone radical cations. The radicals were generated by Ce4+ or Zr4+ oxidation in FSO3H or FSO3H and CH3NO2 solution. The radical cations were stable in strongly acidic media, where they existed in double-protonated form. The splittings of hydroxyl protons were assigned by deuteriation and other coupling constants by the additivity relationship. The cis–trans isomerism of the double-protonated cation radicals showed up clearly in EPR and ENDOR spectra of four of the radicals.
Databáze:	OpenAIRE
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