No abstract available

[en] In electrochemical processes, electron transfer across the solid-liquid interface is the elementary step and electron transfer kinetics is significantly influenced by the interfacial properties. Therefore, preparation of well-defined electrochemical interface with highly controllable properties - larger effective surface area, increased mass transport, and better electronic interaction between the analyte and electrode - is significant for both fundamental and applied studies in electrochemistry. In the present work electrochemistry of Pu(IV)/Pu(III) is studied on multilayered AuNPs-PB-AuNPs functionalized electrode

No abstract available

[en] The kinetic study of the action of a redox system on DNA monomers allowed us to make criticisms on radiomimetic character of this system. Assuming that in both cases, gamma radiolysis of aerated aqueous solutions and action of H₂O₂ / Fe(II) system in the same conditions, the reactive species is the OH radical, we propose the kinetic expressions that are confirmed by our experimental results. Some of the accepted G-values are corrected in view of our results. Al so these results put in evidence mechanisms of molecular repair after radical attack. (Author) 79 refs

[en] This article reviews the preparation, chemical reduction, oxidation, electrocemistry, photochemistry and catalytic functions of niobium and molybdenum porphyrins. (author). 65 refs.; 4 figs.; 16 tabs

[en] Published in summary form only

[en] The linear sweep voltametry technique was used to study the electrochemical behaviour of Re/ReO^-₄ interface in 1M sulfuric acid, in order to establish the different redox reactions involved. It has been possible to partially identify these redox phenomena, in agreement with Pourbaix's thermodynamic diagram of Rhenium. It has been detected the simultaneous participation of ReO^-₄ and Re^- ions in the Rhenium electroxidation. (C.L.B.)

[en] Studies on the coordination chemistry of Np in different oxidation states are important concerns to understand its geochemical behavior. Redox speciation of Neptunium (Np) is investigated in presence of two complexing agents, Citrate and Phenylphosphonic acid (PPA) in aqueous medium by means of cyclic voltammetry. In both the complexing agents, two reduction peaks were obtained, in which first (Np"V"I-Np"V) is reversible and second (Np"V-Np"I"I"I) irreversible. Shift in both the reduction peaks in the presence of citrate and PPA authenticates the Np complexation. Using the Deford-Hume formalism the stability constant of Np species was evaluated to be (2.95±0.08) and (3.38±0.06) in Citrate and PPA respectively. (author)

[en] The relative stability of different oxidation states of actinide elements is influenced by the nature of complexes formed, redox equilibria in aqueous/non-aqueous solutions. Organic soluble hydroquinones have been used as reductants for Pu(IV) to Pu(III) and Np(VI) to Np(V) extracted from nitric acid media. In this context, tert-butyl hydroquinone (TBH) was evaluated as a reductant of plutonium for reprocessing and analytical applications. These interesting applications, however, require an insight in to the redox reactions taking place in the organic phases. Extensive studies have suggested that N,N-dihexyl octanamide (DHOA) is a promising alternative of tributyl phosphate (TBP) for reprocessing applications. This paper presents the spectrophotometric investigations on the redox behavior of Pu(IV) extracted in 1.1 M TBP and 1.1 M DHOA solutions in n-dodecane

[en] The anodic dissolution of electrodeposited iron group elements (Fe, Co, Ni) were studied in phthalate buffer solution. The pH dependence of the corrosion potential, the corrosion current and Tafel slope was measured for each element. Based on the electrochemical parameters including Tafel slopes, we proposed the redox mechanism of the corrosion and the passivation. The adsorption of various phthalate species on the electrodeposited iron group elements seemed to be affected the corrosion mechanisms