A5043748902- Photochemistry and Electron Transfer Studies
- Photopolymerization techniques and applications
- Free Radicals and Antioxidants
- Porphyrin and Phthalocyanine Chemistry
- Spectroscopy and Quantum Chemical Studies
- Radical Photochemical Reactions
- Advanced Polymer Synthesis and Characterization
- Surfactants and Colloidal Systems
- Luminescence and Fluorescent Materials
- Electrochemical Analysis and Applications
- Photochromic and Fluorescence Chemistry
- Protein Interaction Studies and Fluorescence Analysis
- Photodynamic Therapy Research Studies
- Dendrimers and Hyperbranched Polymers
- Advanced Chemical Physics Studies
- TiO2 Photocatalysis and Solar Cells
- Molecular Sensors and Ion Detection
- Analytical Chemistry and Sensors
- CO2 Reduction Techniques and Catalysts
- Silicone and Siloxane Chemistry
- Organic Light-Emitting Diodes Research
- Various Chemistry Research Topics
- Environmental Chemistry and Analysis
- Organic Chemistry Cycloaddition Reactions
- bioluminescence and chemiluminescence research
National University of Río Cuarto
2016-2025
Consejo Nacional de Investigaciones Científicas y Técnicas
2007-2024
Instituto Médico Río Cuarto
2019
Centro Científico Tecnológico - San Juan
2004-2016
Universidad de Santiago de Chile
1999-2001
National University of Engineering
1996-2001
University of Notre Dame
1984-1988
University of Buenos Aires
1972
University of Chile
1970
The photophysics and photochemical behavior of the phenoxazin-3-one dyes, resazurin resorufin, have been studied in aqueous solutions. irradiation presence amines leads to deoxygenation N-oxide group, giving resorufin. This photoreaction is highly dependent on amine structure efficient only tertiary aliphatic amines. absorption fluorescence properties these dyes are pH. At pH above 7.5 both their anionic form. For resorufin this form fluorescent (ΦF= 0.75). lower strongly reduced. dye...
The polymerization of 2-hydroxyethyl methacrylate photoinitiated by riboflavin in the presence triethanolamine was investigated. also studied using as photoinitiator lumichrome, major product obtained anaerobic photoreduction riboflavin. Photopolymerization rates were measured a function amine concentration UV (366 nm) and visible (>450 regions. quenching excited states dyes investigated fluorescence lifetime laser flash photolysis experiments. Quenching rate constants determined absence...
The quenching of excited singlet and triplet states riboflavin, lumiflavin lumichrome was investigated in methanol. quenchers were aromatic electron donors aliphatic amines. Bimolecular rate constants determined from static dynamic fluorescence measurements. Triplet studied by laser flash photolysis. Transient absorption spectra showed the presence semireduced flavins lumichrome, radical cation quenchers. results confirm that for are lower than those similar oxidation potential. Plots vs....
The dye sensitized photooxidation of 2,4‐dichlorophenol, 2,6‐dichlorophenol and 2,4,6‐trichlorophenol in alkaline aqueous solution was studied. inhibition photo‐oxidation by N‐ 3 suggests that the reaction occurs via a singlet oxygen mechanism. polychlorophenols give different proportions with quenching oxygen. total rate constant for process is order 108 to l09 M‐1s‐1. A charge transfer mechanism phenols proposed. quantum yield 0.01 polychlorophenol degradation estimated.
Polymerization rates of 2-hydroxyethyl methacrylate (HEMA) photoinitiated by riboflavin were investigated using as co-initiator several amines different structure. The photoinitiation efficiency is highly dependent on the structure amine. photochemical behavior these systems was under polymerization conditions. results are explained in terms dependence amino radicals production and reactivity toward monomer double bonds with structural features amines.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLaser Flash Photolysis Study of the Photoinitiator System Safranine T-Aliphatic Amines for Vinyl PolymerizationC. M. Previtali, S. G. Bertolotti, Neumann, I. A. Pastre, Rufs, and V. EncinasCite this: Macromolecules 1994, 27, 25, 7454–7458Publication Date (Print):December 1, 1994Publication History Published online1 May 2002Published inissue 1 December...
Abstract— The fluorescence properties of indole, 1,2‐dimethylindole and tryptophan have been determined in sodium bis(2‐ethylhexyl)sulfosuccinate inverse micelles heptane. Fluorescence quenching studies were done using CCl 4 acrylamide as quenchers localized the organic micellar pseudophase respectively. Stern‐Volmer plots show departure from linearity are dependent on emission wavelength. results interpreted a three pseudophases model. 1,2‐Dimethylindole is predominantly solubilized n...
Free radicals produced in the photoinduced electron transfer from triethanolamine to excited riboflavin lead polymerization of 2-hydroxyethyl methacrylate aqueous medium. Polymerization rates increase with amine concentration, reaching a maximun value at 0.01 M amine. Further addition produces decrease polymerization. Time-resolved photolysis studies were carried out under conditions, monomer/water pH 9. These results indicate that proceeds by formed interaction dye triplet Meanwhile,...
Abstract The polymerization of methyl methacrylate photoinitiated by 2‐chlorothioxanthone in the presence amines different structures has been investigated. photoinitiation efficiency these systems is highly dependent on structure amine. rate increases with amine concentration, reaching a constant value an concentration range 10–30 mM. At concentrations, aliphatic hydroxyalkyl are more efficient photoinitiators than corresponding alkyl‐substituted compounds. Dimethylanilines...
A modification of the Bond-Energy–Bond-Order method has been applied to intermolecular photoreduction carbonyl compounds. It provides a way predicting kinetics these reactions as well an insight into role different thermodynamic parameters and shape potential energy surface. The results strongly support biradical model for triplet, in which oxygen atom is formally considered free radical centre. comparison with alternative models also carried out.