Time development in the nanosecond range of the intramolecular excimer fluorescence of 1.3dinaphthylpropane is studied using a single-photon counting technique. The rate constants for the association and dissociation process are obtained at different viscosities. The radiative lifetime of the excime
Time-resolved fluorescence studies on excimer formation in polystyrene
β Scribed by A.J. Roberts; D. Phillips; G. Rumbles; I. Soutar
- Publisher
- Elsevier Science
- Year
- 1981
- Weight
- 75 KB
- Volume
- 17
- Category
- Article
- ISSN
- 0047-2670
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π SIMILAR VOLUMES
The cyclization of a polystyrene chain (M,,=4500, .&4,/M.= 1.08), both ends labelled with I -pyrenyl groups, was studied in toluene and methylcyclohexane from 1 to 3500 bar. The major effect of pressure on the cyclization rate constant comes from its effect upon the viscosity. Nevertheless, for a fu
The Β―uorescence of pyrenyl labelled polystyrene has been investigated. The ratio of excimer to monomer intensities (I e /I m ) is found to vary tortuously with increasing concentration (C) and displays two critical concentration points, C at about 3.2 Γ 10 Γ2 g ml Γ1 and C m at about 0.32 g ml Γ1 .
## Abstract Fluorescence rise and decay processes were measured and rate parameters were determined for the pyreneβtriβ__n__βbutylamine and pyreneβN,Nβdiethylaniline exciplex system in various solvents. An additional activation energy over that for the diffusional motion appears necessary for both