• R J Magee

      Articles written in Journal of Chemical Sciences

    • Electrochemical studies on copper(II) Glucuronate

      R Payne R J Magee

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      The complexes formed in the interaction of the copper(II) ion with glucuronic acid over the pH range 4·0–11·0 were investigated using d.c. polarography, cyclic voltammetry and chronoamperometry. It was found that below about pH 6·1 no complex forms, while in the pH range of approximately 6·2–7·4 and again 7·5–9·8 stable complexes were formed in solution. At high pH values, the complexes appear to break up. The complex formed in the pH range 6·2–7·4 was studied and stability constants determined by two different methods.

    • Electrochemical studies on cobalt tris (acetylacetone)

      R J Magee Bookhari Annuar

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      The electrochemical reduction of cobalt acetylacetonate (Co(acac)3) at the mercury electrode in propylene carbonate anddmso has been carried out using dc polarography, controlled potential coulometry, chronoamporometry and cyelic voltammetry. In propylene carbonate, polarograms showed two well defined waves, one wave being an adsorption pre-wave, the other an irreversible, diffusion-controlled electron transfer process. From chronoamperometry the diffusion coefficient was determined. Cyclic voltammetry confirmed the polarographic results, although additional adsorption waves were found. Indmso, results were similar to those in propylenecarbonate. However, polarograms showed no adsorption pre-wave and additional adsorption waves found in propylene carbonate in the cyclic voltammograms were absent. The mechanism of the reduction process in both solvents is discussed.

    • Electrochemical study of triphenyltin piperidyl dithiocarbamate

      Shubhra Chandra B D James R J Magee

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      The reduction of triphenyltin piperidyl dithiocarbamate in acetone has been investigated using d.c. polarography and cyclic voltammetry. Polarographic reduction yielded four well-defined waves, two of which were diffusion-controlled and two of which appear to represent adsorption processes. The cyclic voltammetric study yielded results in close agreement with the polarographic data. Results appear to indicate the release of the dithiocarbamate moiety, followed by reduction to form the triphenyltin radical, which undergoes dimerization, as well as reduction to the triphenyltin anion. For comparison, the polarographic reduction of triphenyltinchloride was investigated. A mechanism similar to that proposed by earlier authors for the polarographic behaviour of tributyltin oxide was found.

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