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3 Polish Journal of Chemistry

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Transport of Phenanthroline Complexes of Manganese(II) Ions through Nafion Layer on Glassy Carbon Electrode

Nowak L., Andrijewski G., Tomczyk D., Błaszczyk T.

Polish Journal of Chemistry

2009

Vol. 83, nr 12

2195-2203

Apparent diffusion coefficients of [Mn(phen)2(H2O)2]2+ and [Mn(phen)3]2+ in Nafion layer on glassy carbon electrodes were calculated and discussed. Charge transport mechanism was qualified on the basis of voltammetric and coulometric measurements and confirmed by use of the impedance spectroscopy. Electrocatalytic activity against several reductants (glycol aldehyde, glycol acid and ascorbic acid) was examined.

Modification of Glassy Carbon Electrode with Phenanthroline Complexes of Manganese(II) Immobilized in Nafion Layer

Nowak L., Andrijewski G., Tomczyk D., Cichomski M.

Polish Journal of Chemistry

2007

Vol. 81, nr 4

493-503

Complexes of Mn(II) with 1,10-phenanthroline in molar ratios 1:2 and 1:3 were synthesized and immobilized in Nafion layers on a glassy carbon electrode. The character of electrode processes was determined. The coatings were investigated electrochemically to examine the suitability of the modified electrode for electrocatalysis. Mn(III) disproportionation constants in the layer are lower than those in solution. Mn(III)/Mn(II) couple formal potentials are also lower but still high enough to give theoretical possibility to use it as an electrocatalyst. The topography of modifying layer was investigated with atomic force microscopy (AFM).

Complex Formation Equilibria and Potentials of Mn(III)/Mn(II) Couple in the Presence of 1,10-Phenanthroline Derivatives in Aqueous Solutions

Andrijewski G., Nowak L., Tomczyk D., Różański R., Dałkowski R.

Polish Journal of Chemistry

2006

Vol. 80, nr 5

693-701

Formation constants ofMn(II) complexes with 5-nitro-, 5-chloro-, 5-methyl-, 4-methyl-, 2,9-dimethyl-, 4,7-dimethyl- and 5,6-dimethyl-1,10-phenanthroline and formal potentials of Mn(III)/Mn(II) couple in the presence of these compounds by use of potentiometric method were determined and used to calculate formation constants of Mn(III) complexeswith these ligands.Anumerical method of manganese(III) complexes formation constants calculation from potentiometric and voltammetric data was proposed and tested for iron(III) complexes. The influence of substituents on protonation and stability constant values was analyzed taking into account suitability of the ligand to stabilize thermodynamically unstableMn(III) ion and protect it from disproportionation.