Energieübertragung zwischen gleich-und ungleichartigen Molekülen in Lösung III. Experimente über Fluoreszenzlöschung durch absorbierende Fremdstoffe/ Energy Transfer Among Like and Unlike Molecules in Solution III. Study of Fluorescence Quenching by Foreign Absorbing Substances

1975 ◽  
Vol 30 (12) ◽  
pp. 1611-1614 ◽  
Author(s):  
A. Kawski ◽  
M. Stoń
Keyword(s):  
Energy Transfer ◽  
Fluorescence Quenching ◽  
Excitation Energy ◽  
Shell Model ◽  
Electronic Excitation ◽  
Critical Distance ◽  
Electronic Excitation Energy ◽  
Radiationless Energy Transfer ◽  
Good Agreement ◽  
Luminescent Centre

Abstract Energy Transfer Among Like and Unlike Molecules in Solution 111. Study of Fluorescence Quenching by Foreign Absorbing Substances Radiationless energy transfer between unlike molecules (heterotransfer) in fluid solutions was studied by the quenching of fluorescence by foreign absorbing substances. The quenching of electronic excitation energy of 2-aminopurine and 2-aminopyrimidine, acting as sensitizers, and by acridine or 9-methylanthracene, acting as acceptors, was investigated in ethanol and compared with the theory of "multi-shell model" of a luminescent centre. In fluid solutions the critical distance for energy transfer is little depended on the diffusion. Good agreement was found with the equation taking into account only the excitation energy migration.

Elektronenanregungsenergieübergang zwischen gleichartigen Molekülen in Lösung / Electronic Excitation Energy Transfer among like Molecules in Solution

1977 ◽  
Vol 32 (12) ◽  
pp. 1339-1343
Author(s):  
J. Kamiński ◽  
A. Kawski
Keyword(s):  
Energy Transfer ◽  
Excitation Energy ◽  
Shell Model ◽  
Electronic Excitation ◽  
Excitation Energy Transfer ◽  
Photo Luminescence ◽  
Electronic Excitation Energy Transfer ◽  
Electronic Excitation Energy ◽  
Emission Anisotropy ◽  
Good Agreement

Abstract Electronic Excitation Energy Transfer among like Molecules in Solution A theory of the excitation energy transfer among like (bomotransfer) molecules in solution, based on a shell model of the luminescent centre and on the assumptions given in our previous paper * is elaborated. Expressions for the time-dependent concentration depolarisation of the photo-luminescence (for emission anisotropy) in the sphere-and the shell-model are obtained. The expression for the concentration-dependent depolarisation is compared with the experimental results for five luminescent compounds in rigid cellulose acetate films. Good agreement was found with the equation which takes into account the excitation energy remigration.

scholarly journals Energieübertragung zwischen gleich- und ungleichartigen Molekülen in LösungII. Experimente über Konzentrationsdepolarisation der Fluoreszenz / Energy Transfer Among Like and Unlike Molecules in Solution.II. Study of Concentration Depolarization of Fluorescence

1975 ◽  
Vol 30 (1) ◽  
pp. 15-20 ◽  
Author(s):  
A. Kawski ◽  
J. Kamiński
Keyword(s):  
Energy Transfer ◽  
Excitation Energy ◽  
Shell Model ◽  
Cellulose Acetate ◽  
Rhodamine B ◽  
Thermal Relaxation ◽  
Radiationless Energy Transfer ◽  
Concentration Depolarization ◽  
Good Agreement ◽  
Luminescent Centre

AbstractRadiationless energy transfer between like molecules (homotransfer) in thin rigid cellulose acetate films was studied by the concentration depolarization of the photoluminescence. The investigated substances are rhodamine B, 9-methylanthracene and 5-methyl-2-phenylindole. The experimental results have been compared with the “multi-shell model” of a luminescent centre. Good agreement was found with the equation which takes into account the excitation energy remigration. Concentration -depolarization measurements show that the critical distances R1, at which the probability of transfer of the excitation equals that of emission, are dependend on the excited wavelength. This is due to the failure of thermal relaxation of the exciting molecules with their environment.

Theoretical investigation of electronic excitation energy transfer in bichromophoric assemblies

2008 ◽  
Vol 128 (7) ◽  
pp. 074505 ◽  
Author(s):  
Burkhard Fückel ◽  
Andreas Köhn ◽  
Michael E. Harding ◽  
Gregor Diezemann ◽  
Gerald Hinze ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Excitation Energy ◽  
Theoretical Investigation ◽  
Electronic Excitation ◽  
Excitation Energy Transfer ◽  
Electronic Excitation Energy Transfer ◽  
Electronic Excitation Energy

Elektronenanregungsenergieiibergang zwischen ungleichartigen Molekiilen in Losung / Electronic Excitation Energy Transition among unlike Molecules in Solution

1977 ◽  
Vol 32 (2) ◽  
pp. 140-143 ◽  
Author(s):  
J. Kamiński ◽  
A. Kawski
Keyword(s):  
Energy Transfer ◽  
Excitation Energy ◽  
Excitation Energy Transfer ◽  
Energy Transition ◽  
Mutual Orientation ◽  
Resonance Excitation ◽  
Electronic Excitation Energy ◽  
Radiationless Energy Transfer ◽  
Donor And Acceptor ◽  
Acceptor Molecules

In studying the radiationless energy transfer between unlike molecules (heterotransfer) in fluid and rigid solutions the fluctuations of the concentration of the acceptor molecules, as well as the dependence of the probability of resonance excitation energy transfer on the mutual orientation of the transition moments of the interacting donor and acceptor molecules have been taken into account. With these and the assumptions of the shell model of a luminescent centre (A. Kawski and J. Kaminski, Z. Naturforsch. 29 a, 452 [1974]) one obtains the Förster expression for the quantum yield of the donor fluorescence quenched by foreign absorbing substances

Depolarization of Photoluminescence of Isotropic Solutions Produced by Excitation Energy Migration

1987 ◽  
Vol 42 (8) ◽  
pp. 813-818
Author(s):  
A. Kawski ◽  
J. Kamiński
Keyword(s):  
Experimental Data ◽  
Energy Transfer ◽  
Excitation Energy ◽  
Master Equation ◽  
Shell Model ◽  
Excitation Energy Transfer ◽  
Critical Distance ◽  
Energy Migration ◽  
Isotropic Solution ◽  
Fluorescence And Phosphorescence

A theory of the excitation energy transfer between like molecules in isotropic solution based on a centre or shell model of a primarily excited luminescent molecule and on the extended Förster “excitation master equation” has been elaborated. Fluorescence and phosphorescence depolarization are shown to be governed by singlet-singlet energy migration and described by the same expression. The comparison of the theoretical curve with the experimental data obtained by Gondo et al. (1975) for benzo[f]quinoline in ethanol glass at 77 K results in the following critical distance R0 for the excitation energy migration: 21.5 Å for fluorescence and phosphorescence, respectively.

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