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Polycyclic Aromatic Nitrogen Heterocycles. Part II: Effect of Solvent Polarity on the Fluorescence Emission Fine Structure of Three Azapyrene Compounds

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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.

Keywords: Fluorescence; Molecular structure

Document Type: Research Article


Affiliations: 1: 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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