Time-resolved interaction of polar solvents with excited pyrylium cations

  • Wintgens V
  • Pouliquen J
  • Valat P
 et al. 
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Abstract

The time-resolved fluorescence spectra of two pyrylium-ion derivatives have been investigated. In the temperature range 77 to 190 K, a red-shift of the fluorescence spectra of the order of 25-70 nm is observed and assigned to a fast solvent relaxation process. Time-resolved experiments carried out at 160 K showed a rapid decrease of the emission from the non-relaxed excited state at short wavelengths and a corresponding build-up of the emission of the relaxed one at longer wavelengths. At 120 K emission from the non-relaxed electronic state is predominant. © 1986.

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Authors

  • Veronique Wintgens

  • Joseph Pouliquen

  • Pierre Valat

  • Jean Kossanyi

  • Silvio Canonica

  • Urs P. Wild

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