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a (A) Cyclization byproduct experiment. (B) Radical trapping experiments. (C) Fluorescence spectra of 4CzIPN in 1,4-dioxane (0.01 mM) before and after the addition of different amounts of (1) C6F6, (2) iodocyclohexane, and (3) Et3N. (4) The resulting Stern–Volmer plot.
