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Spectroscopic Properties of Polycyclic Aromatic Compounds. Part IV: Effect of Solvent Polarity and Nitromethane on the Fluorescence Emission Behavior of Select Bipolycyclic Aromatic Hydrocarbons

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Fluorescence emission behavior is reported for 1,1'-binaphthalene, 2,2'-binaphthalene, 9,9'-bianthracene, 9,9'-biphenanthrene, 1,1'-methylene-bisnaphthalene, and 1,1',2,2'-tetrahydro-5,5'-biacenaphthylene dissolved in organic nonelectrolyte solvents of varying polarity, refractive index, and dielectric constant. Fluorescence measurements are used to classify the six bipolycyclic aromatic hydrocarbon (bi-PAH) solutes as either solvatochromic probe or nonprobe molecules, depending upon whether measured fluorescence properties vary with solvent nature. Of the bi-PAHs studied, only 9,9'-bianthracene exhibited probe character. Possible correlations between 9,9'-bianthracene's maximum intensity emission wavelength and select functions of solvent refractive index and dielectric constant were examined. Also reported is the effect that nitromethane has on bi-PAH fluorescence emission intensities.

Keywords: Fluorescence; Molecular structure; Spectroscopic techniques

Document Type: Research Article


Affiliations: 1: Department of Chemistry, University of North Texas, Denton, Texas 76203-5068, U.S.A. 2: Rütgerswerke AG, Postfach 2002 41/51/61, D-44558 Castrop-Rauxel, Germany 3: Department of Chemistry, University of Victoria, P.O. Box 3055, Victoria, BC V8W 3P6, Canada

Publication date: April 1, 1994

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