Zur Temperatur- und Viskositätsabhängigkeit der Fluoreszenzquantenausbeuten von donator-substituierten 4′-Diphenylphosphinyl-trans-stilbenen in wenig viskosen Lösungsmitteln unterschiedlicher Polarität
✍ Scribed by Dr. D. Gloyna; Dr. L. Alder; Dipl.-Chem. D. Repke
- Publisher
- John Wiley and Sons
- Year
- 1982
- Tongue
- English
- Weight
- 562 KB
- Volume
- 324
- Category
- Article
- ISSN
- 1615-4150
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✦ Synopsis
The Dependence of Fluorescence Quantum Yields of Donor Substituted 4′‐Diphenylphosphinyl trans‐Stilbenes on Temperature and Viscosity in Low Viscous Solvents of Different Polarity
The dependence of fluorescence quantum yields of donor substituted 4′‐diphenylphosphinyl trans‐stilbenes 1 on temperature was investigated between 15–65°C in toluene and n‐propanol. It is concluded that the fluorescence quantum yield dependence on temperature is due to the dependence of nonradiative deactivation on solvent viscosity. The nonradiative deactivation is attributed to the ethylene bond rotation in 1. The rotation around the ethylenic bond and the fluorescence are the two most important deactivation processes detected up to now for the first excited singlet of 1 in liquid solution.