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Electrochemical behaviour of the Ni(II)/Ni(Hg) system in dimethylsulphoxide (DMSO) and DMSOH2O mixtures

✍ Scribed by L. Janiszewska; Z. Galus

Publisher
Elsevier Science
Year
1984
Tongue
English
Weight
723 KB
Volume
29
Category
Article
ISSN
0013-4686

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✦ Synopsis

Using cyclic voltammetry and single and double pulse chronocoulometry the eiectroreduction of nickel@) and oxidation of homogeneous nickel amalgam formed in situ have been studied in DMSO and its mixtures with water. Nickel(I1) electroreduction current in these media exhibitsa kineticcharacter, similar to that observed in aqueous and dimethylformamide (DMF) solutions. This kinetic cm-rent, under comparable conditions, correlates well with the rate of exchange of solvent molecules in corresponding Ni(Il)-solvates. With an increase of the DMSO content in a mixture one observes a decrease of the standard rate constant of Ni electrode reaction by about two orders of magnitude. The standard rate constant in several pure solvents, related to water value, is approximately linearly dependent on free energy of txansfer of nickel(H) ions from water to these solvents.

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