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Electrooxidation of Poly (p-Aminoazobenzene) Films-Kinetic Studies

Frydrychewicz A., Jackowska K.

Polish Journal of Chemistry

2004

Vol. 78 / nr 9

1523-1532

The electrooxidation of poly (p-aminoazobenzene) [poly (p-AAB)] was studied in the presence of H+ and of Fe(CN)6 4 ions by the means of cyclic voltammetry, chronoamperometry and rotating disc electrode. The diffusion coefficients and heterogeneous rate constants were determined from the analysis of Cottrell and Levich-Koutecky plots. It has been found, that the oxidation of poly (p-AAB) in acidic solution is kinetically controlled and independent of the transport of H+ ions to the polymer surface. The results obtained in the presence of Fe(CN)6 4 have shown that poly (p-AAB) films are permeable to the ions from electrolyte solution.

Cyclic Voltammetry and Electronic Absorption Spectroscopy in Investigations of the Nature of the Electrochemical reduction of Phenyldiazonium and Phenyl-bis-diazonium Cations

Koval'chuk E., Kozlovs'ka Z., Jackowska K., Roshal A., Wróblewska A., Reshetnyak O., Błażejowski J.

Polish Journal of Chemistry

2004

Vol. 78 / nr 1

139-147

The electrochemical reduction of phenyldiazonium and phenyl-bis-diazonium cations on mercury drop and platinum cathodes exhibits a multistep nature, as demonstrate the results of polarographic and cyclic voltammetry measurements. The primarily formed radicals participate in various secondary processes, as a result of which occur species absorbing UV-VIS radiation. Electronic absorption in the visible region can be ascribed to entities forming from the recombination of two azophenyl or azophenyl and phenyl radicals, originating from the one- or two-electron reduction of primarily or secondary formed cations.

Surface-Enhanced Raman Spectroscopy and Electrochemical studies of 4-Phenylpyridine Adsorption at the Silver/Solution Interface

Bukowska J., Calvo M., Jurkiewicz-Herbich M., Jackowska K.

Polish Journal of Chemistry

2002

Vol. 76 / nr 8

1151-1162

The adsorption of 4-phenylpyridine (4-PhPy) on silver was examined using conventional electrochemical techniques: cyclic voltammetry, impedance measurements and surface enhanced Raman spectroscopy (SERS) in a wide range of electrode potentials. Electrochemical results indicate a weaker adsorption of 4-PhPy molecules on Ag than on Au electrode, but considerably stronger than adsorption of pyridine. For saturated solutions the Raman results point out the reorientation of the 4-PhPy molecules from more flat configuration at potentials more positive than -0.7 V vs SCE, to more perpendicular one at more negative potentials. This reorientation may be connected with the formation of stable surface complexes at potentials more positive than -0.7 V and of molecular stacks at more negative electrode potentials.