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À propos de : Photoinduced Electron Transfer between Polystyrene and 2,4,6-TriphenylpyryliumTetrakis(pentafluorophenyl)gallate in Solutions and in Polymer Films        

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  • Photoinduced Electron Transfer between Polystyrene and 2,4,6-TriphenylpyryliumTetrakis(pentafluorophenyl)gallate in Solutions and in Polymer Films
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  • Photoinduced electron transfer between polystyrene and 2,4,6-triphenylpyrylium tetrakis(pentafluorophenyl)gallate (TPPGa) has been studied in dichloromethane solution and in poly(vinyl chloride) film by steadystate and time-resolved fluorescence quenching techniques. A dependence of the observed rate constant offluorescence quenching and the theoretical dependence of the diffusion constant on the molecular weight ofthe polystyrene were derived. Positive curvature in Stern−Volmer plots for quenching with polystyrene andtoluene in solution and negative curvature in the Perrin plot for polystyrene in film was observed. No newabsorption or fluorescence bands appeared upon addition of the donor to the dichloromethane solution ofTPPGa. Forward and back electron transfer is the possible pathway for stabilization of TPPGa in polystyrenebecause 100% of TPPGa can be recovered even after prolonged irradiation.
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