EPR Study of Nitroxyl Radicals of Substituted 5-Anilinotriazoles, 5-Anilinotetrazoles, and 2-Anilinobenzimidazoles

Abstract

Substituted 5-anilinotriazoles V, 5-anilinotetrazoles VI and 2-anilinobenzimidazoles VII were oxidized by RO2• radicals to the corresponding nitroxyls VIII-X in a non-polar medium. The nitroxyls were characterized by the distribution of spin density into both benzene and N-heterocyclic rings. The influence of substitutents at various positions on the values of aNNO splitting constant was evaluated. The EPR spectral parameters of nitroxyls VIII-X were compared with those for the diphenylnitroxyl radical IV.