Electron Spin Resonance Study on the Photoinduced Radicals from Carcinogenic 4-Nitroquinoline 1-Oxide

Abstract

UV-irradiation of 4-nitroquinoline 1-oxide in solutions, that is, in dioxane, in benzene, and in hexane, induced stable radicals which were investigated by ESR spectroscopy. Hyperfine structures of spectra thus obtained are different from each other depending on the sort of the solvents used. Determination of these radical structures were carried out by help of isotope-containing 4-nitroquinoline 1-oxides and, in particular, the structure of dioxane type radical was proposed, based on spectral changes by isotope replacement.