Abstract
A detailed analysis of the E. P. R. spectra of the anion and diprotonated cation radicals of partly hydrogenated phenazine derivatives is presented. Furthermore, the gyromagnetic ratios of the pyrazine, tetramethylpyrazine, quinoxaline and phenazine radicals are measured. Higher than those of the corresponding aromatic radicals, the g factors are correlated to the nitrogen hyperfine coupling constant. This shows the effect of the 2 p spin-orbit coupling of the nitrogen and of the unpaired electron-spin density on the nitrogen in this series of 1,4-diazines.
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