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Efficient Photoredox Cycles to Control Perylenediimide Self-Assembly.
Chemistry
January 2023
Université de Strasbourg, CNRS, UMR7140, 4 Rue Blaise Pascal, 67081, Strasbourg, France.
Article Synopsis
- * It reveals that full 2-electron photoreduction of PDI can be accomplished using UVC light, either through direct photoreduction in anaerobic conditions or indirect photoreduction in aerobic conditions via acetone ketyl radicals.
- * Additionally, this efficient photoreduction method can be extended to other dyes like naphthalenediimide (NDI) and methylviologen (MV), and it is particularly promising for future use in light-driven systems and materials.
Aqueous TiO Nanoparticles React by Proton-Coupled Electron Transfer.
Inorg Chem
January 2022
Department of Chemistry, Yale University, New Haven, Connecticut 06520-8107, United States.
Redox reactions of aqueous colloidal TiO 4 nm nanoparticles (NPs) have been examined, including both citrate-capped and uncapped NPs (-TiO and -TiO). Photoreduction gave stable blue colloidal -TiO NPs with 10-60 electrons per particle. Equilibration of these reduced NPs with soluble redox reagents such as methylviologen (MV) provided measurements of the colloid reduction potential as a function of pH.
View Article and Find Full Text PDFExcited States versus Reaction Intermediates as Active Species in Photoinduced Redox Reactions of Cyrhetrenyl and Ferrocenyl Chalcones: A 351 nm Flash Photolysis Study.
J Phys Chem A
October 2019
Departamento de Química de los Materiales, Facultad de Química y Biología , Universidad de Santiago de Chile , Casilla 40 , Santiago , Chile.
The photoinduced redox reactions of two organometallic chalcones: , , (η-CHC(O)CH═CH-4-benzo-15-crown-5)Re(CO), , and , , (η-CHC(O)CH═CH-4-benzo-15-crown-5)Fe(η-CHC(O)CH═CH-4-benzo-15-crown-5), , were investigated in fluid solution using the flash photolysis technique. For a better understanding of the photoinduced redox processes of these organometallic chalcones, an electron donor, triethylamine (TEA), and an electron acceptor, methylviologen dichloride (MVCl), were chosen. Two parallel reaction paths for the decay of the intermediate , that is, the anion radical of , were observed in the presence of TEA.
View Article and Find Full Text PDFUltrafast Photoinduced Interfacial Proton Coupled Electron Transfer from CdSe Quantum Dots to 4,4'-Bipyridine.
J Am Chem Soc
January 2016
Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States.
Pyridine and derivatives have been reported as efficient and selective catalysts for the electrochemical and photoelectrochemical reduction of CO2 to methanol. Although the catalytic mechanism remains a subject of considerable recent debate, most proposed models involve interfacial proton coupled electron transfer (PCET) to electrode-bound catalysts. We report a combined experimental and theoretical study of the photoreduction of 4,4'-bipyridium (bPYD) using CdSe quantum dots (QDs) as a model system for interfacial PCET.
View Article and Find Full Text PDFNear unity quantum yield of light-driven redox mediator reduction and efficient H2 generation using colloidal nanorod heterostructures.
J Am Chem Soc
July 2012
Department of Chemistry, Emory University, Atlanta, Georgia 30322, USA.
The advancement of direct solar-to-fuel conversion technologies requires the development of efficient catalysts as well as efficient materials and novel approaches for light harvesting and charge separation. We report a novel system for unprecedentedly efficient (with near-unity quantum yield) light-driven reduction of methylviologen (MV(2+)), a common redox mediator, using colloidal quasi-type II CdSe/CdS dot-in-rod nanorods as a light absorber and charge separator and mercaptopropionic acid as a sacrificial electron donor. In the presence of Pt nanoparticles, this system can efficiently convert sunlight into H(2), providing a versatile redox mediator-based approach for solar-to-fuel conversion.
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