Profluorescent verdazyl radicals – synthesis and characterization

Abstract

The synthesis and characterization of various 6-oxo-verdazyl radicals and their diamagnetic styryl radical trapping products are presented. It is shown that styryl radical trapping products derived from <i>N</i>-phenyl verdazyls show fluorescence whereas the <i>N</i>-methyl congeners are non-fluorescent. In the parent <i>N</i>-phenyl verdazyls fluorescence is fully quenched which renders these compounds highly valuable profluorescent radical probes.