Synthesis, structural, and magnetic characterization of substituted benzoimidazole-l-yl N,N'-dioxides

The crystal structures, EPR spectra and magnetic properties of the novel halogen- and cyano-substituted nitronyl nitroxide radicals 2-(2,6-dichlorophenyl)benzimidazolyl N,N'-dioxide, 6, 2-(2,6-difluorophenyl)benzimidazolyl N,N'- dioxide, 7, 2-(2-chloro-6-fluorophenyl)benzimidazolyl N,N'-dioxide, 8, 2-(2,3,6-trichlorophenyl)benzimidazolyl N,N'- dioxide, 9, 2-(2,3,4,5,6-pentafluorophenyl)benzimidazolyl N,N'-dioxide, 10, and 2-(3-cyanophenyl)benzimidazolyl N,N'-dioxide, 11, are reported. Compound 6 crystallizes in the triclinic crystal system in space group P1.¯ The molecules of 6 are arranged in pairs with short intermolecular distances between the NO groups.