The triple fluorescence of benzanilide and the dielectric medium modulation of its competitive excitation |
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Authors: | Jozef Heldt David Gormin Michael Kasha |
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Institution: | Institute of Molecular Biophysics and Department of Chemistry, The Florida State University, Tallahassee, FL 32306-3015, USA |
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Abstract: | The fluorescence of the benzanilide molecule at 298 K is inferred to consist of three independent electronic transitions associated with the single ground-state molecular species. F1 (λmax340 nm), the normal fluorescence is observed weakly and is ascribed to an n,π*,-π,π* mixed state. F′2 is ascribed to the proton-transfer imidol tautomer fluorescence (previously reported) with unresolved λmax (inferred at ≈460 nm). F″2 is ascribed to a charge-transfer state fluorescence to the ground state, and occurs as a resolved CT transition in tetrahydrofuran at λmax 520 nm. Comparison of the spectra of N-methylbenzanilide exhibiting only F1 and F″2 (CT) permitted the analysis of the benzanilide spectra. |
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