Abstract: | N-Methyl and N-ethylphenothiazines were oxidized with bromine and sodium perchlorate to give stable cation radical salts. Their well-resolved epr spectra were obtained in nitromethane solution. In order to assign the hfs constants, the cation radicals of N-deuteriomethyl and N-deuterioethylphenothiazines were prepared with lead tetraacetate and trifluoroacetic acid in solutions. |