Long range electron transfer quenching in polyamine chains bearing a terminal naphthalene unit

F. Pina, J. C. Lima, C. Lodeiro, J. S. de Melo, P. Diaz, M. T. Albelda, E. Garcia-Espana

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Abstract

The fluorescence emission of a naphthalene unit attached to a polyamine chain is quenched by intramolecular electron transfer from the deprotonated amines to the excited fluorophore. Measurements of the respective quenching rate constants as a function of the distance, reveal an exponential dependence with beta = 0.45 Angstrom(-1). Identical measurements carried out in deuterated water have shown a similar dependence with the distance beta = 0.49 Angstrom(-1) but an average reduction of the absolute values of the rate constants of ca. 1.2. The polyamine chains seem to constitute a bridge through which the electron can find a route to its movement, more efficiently than through space.
Original languageEnglish
Pages (from-to)8207-8212
JournalJournal of Physical Chemistry A
Volume106
Issue number35
DOIs
Publication statusPublished - 5 Sep 2002

Keywords

  • RATES
  • CHEMOSENSORS
  • DEPENDENCE
  • DISTANCE
  • SOLVENT
  • ENERGY
  • BOND

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