title: Q-band EPR spectroscopy of photogenerated quartet state organic nitreno radicals.
abstract: Q-band 34 GHz EPR spectra are reported for quartet state 2-(para-nitrenophenyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazole-3-oxide-1-oxyl and 3-(para-nitrenophenyl)-1,5,6-triphenylverdazyl reactive intermediates generated from the corresponding azido precursors under frozen matrix photochemical conditions, in situ in a Q-band resonator. Comparison of the Q-band spectra to those generated under conventional X-band (9-10 GHz) conditions shows the much superior resolution of transitions in the g > 2 region of the former. Spectral transitions assigned by line shape simulation yield the zero field splittings for the nitreno-radical species.
authors.affiliation: Department of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003, United States.
authors.forename: Tamara L
authors.initials: TL
authors.lastname: Allen
authors.forename: Paul M
authors.initials: PM
authors.lastname: Lahti