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2 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.

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.