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Electron spin resonance study of some polycyclic nitrogen heterocyclic radical anions
Author(s) -
Sevenster Arjen J. L.,
Tabner Brian J.
Publication year - 1984
Publication title -
organic magnetic resonance
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0030-4921
DOI - 10.1002/mrc.1270220810
Subject(s) - phenazine , quinoxaline , hyperfine structure , chemistry , unpaired electron , electron paramagnetic resonance , photochemistry , radical , spectral line , nitrogen , radical ion , dimethylformamide , nuclear magnetic resonance , organic chemistry , atomic physics , ion , solvent , physics , astronomy
In dimethylformamide the ESR spectra of the radical anions of dibenzo[ f , h ]quinoxaline and dibenzo[a,c]phenazine both exhibit line broadening due to slow molecular tumbling over a wide temperature range. Similar effects are also observed in the spectra of the radical anions of quinoxaline and phenazine. The ESR spectra of the radical anions of dibenzo[f,h]quinoxaline and dibenzo[a,c]phenazine have been interpreted by computer reconstruction and the hyperfine splitting constants assigned with the aid of Hückel unpaired electron density calculations.