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Étude théorique et expérimentale de la relaxation des états excites du colorant laser DCM. Transfert d’électron intramoléculaire et photoisomerisation. Effets de solvant

Abstract : This research thesis reports the study of a styrenic laser dye, the 4-(dicyanomethylene)-2-methyl-6-[p-(dimethylamino) styryl]-4H-pyrane or DCM for the characterization of the first electronic states and of the influence of the solvent on efficiencies of different relaxation processes of the first excited state S1 of the DCM. Due to the presence of a combination of a donor group and acceptor group, this compound has interesting properties of intra-molecular charge transfer and of photo-isomerization which highly depend on solvent polarity. Two approaches have been adopted to study these complementary processes: an experimental approach (determination of rate constants of the different deactivation ways of the S1 state by measuring fluorescence quantum efficiencies, photo-isomerization quantum efficiencies, and fluorescence lifetimes of DCM in about twenty solvent of increasing polarity), and a computational approach (a CS-INDO-MRI type quantum chemistry calculation to obtain potential energy curves, charge distributions, and dipolar moments of DCM first electronic states).
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Sylvie Marguet. Étude théorique et expérimentale de la relaxation des états excites du colorant laser DCM. Transfert d’électron intramoléculaire et photoisomerisation. Effets de solvant. Chimie. Universite de Paris-Sud, Centre d'Orsay (France), 1992. Français. ⟨tel-03313815⟩

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