Fluorescence emission spectra are reported for 1-azapyrene, 2-azapyrene, and 4-azapyrene dissolved in several nonelectrolyte solvents of varying polarity. Results of these measurements show that all three solutes are unsuitable for solvent polarity probes, as the calculated emission
intensity ratios remain nearly constant, irrespective of solvent polarity. Abnormal fluorescence behavior was also noted for 1-azapyrene and 2-azapyrene dissolved in several chlorinated solvents. Time-dependent fluorescence spectra for 1-azapyrene in dichloromethane suggest a possible photochemical
reaction between the PANH solute and chlorinated solvent molecule.
Department of Chemistry, University of North Texas, Denton, Texas 76203-5068 2:
SRI International, 333 Ravenswood Avenue, Menlo Park, California 94025
Publication date: January 1, 1991
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