Concept

Photoexcitation

Publications associées (7)

Photochemical Alkynylations with Hypervalent Iodine Reagents

Over the past twenty years, photochemical transformations have gained in importance in organic chemistry. Indeed, the development of photocatalysts has allowed the use of visible light as an energy source for chemical transformations. More specifically, ph ...

EPFL2022

Laser flash photolysis study of the photoinduced oxidation of 4-(dimethylamino)benzonitrile (DMABN)

Urs von Gunten, Frank Jonathan Leresche, Silvio Canonica

Aromatic amines are aquatic contaminants for which phototransformation in surface waters can be induced by excited triplet states of dissolved organic matter ((DOM)-D-3*). The first reaction step is assumed to consist of a one-electron oxidation process of ...

ROYAL SOC CHEMISTRY2019

Kinetics of the Regeneration by Iodide of Dye Sensitizers Adsorbed on Mesoporous Titania

Shaik Mohammed Zakeeruddin, Jacques-Edouard Moser, Arianna Marchioro, Julien Alexandre Andres, Peng Wang, Joël Teuscher

Regeneration of dye sensitizer molecules by reducing species contained in the electrolyte is a key mechanism in liquid dye-sensitized solar cells because it competes kinetically with a detrimental charge recombination process. Kinetics of the reduction by ...

Amer Chemical Soc2014

Efficient sensitization of Ln(3+)-doped NaYF4 nanocrystals with organic ligands

Marinella Mazzanti

Ligand-capped lanthanide-doped fluoride nanocrystals have been prepared and fully characterized. Organic ligands can be used to promote efficient sensitization of lanthanide luminescence in the fluoride matrix up to a 330-fold enhancement in intensity, and ...

2013

Benzothiazole- and Benzoxazole-Substituted Pyridine-2-Carboxylates as Efficient Sensitizers of Europium Luminescence

Rosario Scopelliti, Jean-Claude Bünzli, Frédéric Gumy

A facile synthesis of benzothiazole- and benzoxazole-substituted pyridine-2-carboxylic acids has been developed. These ligands form mononuclear nine-coordinate complexes [Ln(κ3-ligand)2(κ1-ligand)(H2O)2] with light and heavy trivalent lanthanides, as estab ...

2009

Photochemical and photophysical properties of diketopyrrolopyrrole organic pigments

Various aspects of the pigment class based on 1,4-diketo-3,6-diphenyl-pyrrolo(3,4-c)pyrrole (DPP) are investigated. The thesis consists of two parts: the first part, motivated by the degradation problems of DPP, focuses on the molecular photophysics of the ...

EPFL1997

Dynamique des réactions de transfert d'électrons induites par la lumière à la surface de semi-conducteurs colloïdaux

Studies have been carried out on aqueous colloidal suspensions of semiconductors, principally by using laser flash-photolysis techniques, in order to scrutinize in detail the dynamics of light-induced charge transfer reactions occuring at the solid-electro ...

EPFL1986

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