ChemInform Abstract: ELECTRONIC EXCITATION TRANSFER IN POLYMERS. 3. SINGLET-SINGLET, TRIPLET-SINGLET, AND TRIPLET-TRIPLET ENERGY TRANSFERS. EVIDENCE FOR TRIPLET MIGRATION AMONG PENDANT PHENYL GROUPS OF POLYSTYRENE

1978 ◽  
Vol 9 (34) ◽  
Author(s):  
N. J. TURRO ◽  
I. E. KOCHEVAR ◽  
Y. NOGUCHI ◽  
M.-F. CHOW
Keyword(s):  
Electronic Excitation ◽  
Excitation Transfer ◽  
Triplet Energy ◽  
Energy Transfers

Un exemple d'isomérisation radicalaire en chaînes: la photoinduction de l'isomérisation cis–trans de la pentène-3 one-2

1977 ◽  
Vol 55 (22) ◽  
pp. 3915-3926 ◽  
Author(s):  
Armel Rioual ◽  
André Deflandre ◽  
Jacques Lemaire
Keyword(s):  
Energy Transfer ◽  
Quantum Yields ◽  
Unsaturated Ketone ◽  
Chain Process ◽  
Triplet Energy ◽  
Low Concentrations ◽  
Energy Transfers ◽  
Donor And Acceptor ◽  
A Chain ◽  
Triplet Energy Transfer

Mechanisms of the photosensitized cis–trans photoisomerization of 3-penten-2-one which do not imply only classical triplet–triplet energy transfer are proposed; they are based upon measurements of the variations of initial quantum yields of isomerization with the initial donor and acceptor concentrations, the wavelength of excitation, and the nature of the donor and of the solvent. Carbonyl donors (acetophenone, benzophenone, acetone) induce a radical isomerization by a chain process in reducing solvents; the example of acetophenone is specially interesting. In solvents in which the donor is not photoreduced (as benzene or CCl4) classical triplet–triplet energy transfers occur. Sensitization with aromatic donors (benzene, mesitylene) proceeds through triplet–triplet energy transfer at low concentrations of the acceptor. At higher concentrations of acceptor, an exciplex is formed between the ketone and the aromatic in its singlet excited state; this exciplex is deactivated by dissociation and by causing the isomerization of the α,β-unsaturated ketone.

Design of Molecular Photonic Wires Based on Multistep Electronic Excitation Transfer

ChemPhysChem ◽  
2005 ◽  
Vol 6 (2) ◽  
pp. 217-222 ◽  
Author(s):  
Philip Tinnefeld ◽  
Mike Heilemann ◽  
Markus Sauer
Keyword(s):  
Electronic Excitation ◽  
Excitation Transfer ◽  
Photonic Wires

Effect of chromophore diffusion on electronic excitation transfer in micellar systems

1997 ◽  
Vol 276 (3-4) ◽  
pp. 274-281 ◽  
Author(s):  
Stephan Matzinger ◽  
Kristin Weidemaier ◽  
Michael D. Fayer
Keyword(s):  
Electronic Excitation ◽  
Excitation Transfer ◽  
Micellar Systems
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