✦ LIBER ✦

Time-resolved interaction of polar solvents with excited pyrylium cations

✍ Scribed by Veronique Wintgens; Joseph Pouliquen; Pierre Valat; Jean Kossanyi; Silvio Canonica; Urs P. Wild

Book ID: 103024352
Publisher: Elsevier Science
Year: 1986
Tongue: English
Weight: 648 KB
Volume: 123
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(86)80073-2

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✦ Synopsis

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.

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