The impact of perchlorate ions and acetonitrile medium on copper redox couple was investigated. The acetonitrile solvent and perchlorate ions were found to synergistically increase the redox potential of Cu(II)-Cu(I) couple, thereby increasing its ability to oxidize more systems and expand the copper redoxi metric analysis window. The difference in the behavior of thiourea towards copper(II) salts in aqueous and non aqueous media was also explored. Based on the synergistic effect, an electroanalytical method for com position analysis of copper(I) thiourea complexes was proposed. Kinetic and quantum chemical studies have been used for mechanistic insight into synergistic effect of acetonitrile and perchlorate ions on copper redox couple.
Abstract. Transition metal ions in their free state bring unwanted biological oxidations generating oxidative stress. The ligand modulated redox potential can be indispensable in prevention of such oxidative stress by blocking the redundant bio-redox reactions. In this study we investigated the comparative ligand effect on the thermo-kinetic aspects of biologically important cysteine iron (III) redox reaction using spectrophotometric and potentiometric methods. The results were corroborated with the complexation effect on redox potential of iron(III)-iron(II) redox couple. The selected ligands were found to increase the rate of cysteine iron (III) redox reaction in proportion to their stability of iron (II) complex (EDTA < terpy < bipy < phen). A kinetic profile and the catalytic role of copper (II) ions by means of redox shuttle mechanism for the cysteine iron (III) redox reaction in presence of 1,10-phenanthroline (phen) ligand is also reported.
The study involves the dynamic evolution of the Briggs–Rauscher (BR) reaction in the presence of various surfactants—SDS (sodium dodecyl sulphate) as anionic, CTAB (cetyl trimethylammonium bromide) as cationic and TritonX‐100 [4‐(1,1,3,3‐(tetramethylbutyl) phenyl polyethylene glycol] as a neutral one in single as well as mixed mode conditions (SDS + TX‐100 and CTAB + TX‐100). The reaction has been monitored potentiometrically at 30 °C under CSTR conditions. These surfactants affect the reaction dynamics to an extent which depends on the nature and concentration of the surfactant and the formation of their self‐assemblies. The experimental findings indicate that the oscillatory behavior of the BR reaction in the presence of surfactants is due to the efficacy of organized surfactant assemblies to selectively distribute the key species involved in the reaction, and their interaction with the counter ions in cases of ionic micelles. The study reveals that the evolution of oscillatory behavior is a characteristic feature of the surfactant.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.