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.
Wintgens, V., Pouliquen, J., Valat, P., Kossanyi, J., Canonica, S., & Wild, U. P. (1986). Time-resolved interaction of polar solvents with excited pyrylium cations. Chemical Physics Letters, 123(4), 282–288. https://doi.org/10.1016/0009-2614(86)80073-2