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Excited state chemistry of flavone derivatives in a confined medium: ESIPT emission in aqueous media

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Abstract

The excited state behavior of two flavone derivatives 3-hydroxyflavone and 4′-N,N-diethylaminoflavonol in a confined medium indicates that supramolecular effects could alter the nature of the fluorescence emission. Within the octa acid host the neutral unionized species of these two dyes are present showing large Stokes shifted emission due to intramolecular proton transfer, a pattern different from that in aqueous medium.

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Authors and Affiliations

  1. Department of Chemistry, University of Miami, Coral Gables, Florida, 33124, USA

    Fabiano S. Santos, Elamparuthi Ramasamy & V. Ramamurthy

  2. Grupo de Pesquisa em Fotoquímica Orgânica Aplicada, Instituto de Química, Departamento de Química Orgânica, UFRGS, CEP 91501-970, Porto Alegre, RS, Brazil

    Fabiano S. Santos & Fabiano S. Rodembusch

Authors
  1. Fabiano S. Santos
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  2. Elamparuthi Ramasamy
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  3. V. Ramamurthy
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  4. Fabiano S. Rodembusch
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Corresponding author

Correspondence to Fabiano S. Rodembusch.

Additional information

Electronic supplementary information (ESI) available: Anionic structures of the flavonols, detailed spectroscopic characterization, 1H NMR titration plots, relevant data from the photophysical study, time resolved fluorescence decay curves and details from the materials and methods. See DOI: 10.1039/c4pp00096j

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Santos, F.S., Ramasamy, E., Ramamurthy, V. et al. Excited state chemistry of flavone derivatives in a confined medium: ESIPT emission in aqueous media. Photochem Photobiol Sci 13, 992–996 (2014). https://doi.org/10.1039/c4pp00096j

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  • DOI: https://doi.org/10.1039/c4pp00096j

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