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1 2004

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Cyclic Voltammetric Study of the Complexation of Pb2+ Ions by Dibenzopyridino-18-crown-6 in Some Nitriles

Chojnacka-Kalinowska G., Kalinowski M.

Polish Journal of Chemistry

2004

Vol. 78 / nr 9

1605-1610

A cyclic voltammetric study of the interaction of Pb2+ ions with dibenzopyridino-18-crown-6 in acetonitrile, propionitrile, butyronitrile, benzyl cyanide and benzonitrile has been carried out at various temperatures. Stability constants of the resulting 1:1 complexes were found to decrease with increasing DN, the solvent donor number. The enthalpy and entropy of complexation were calculated from the temperature dependence of the stability constants; the complexes were enthalpy stabilized, but entropy destabilized in all the solvents under study. The relationships DeltaHo vs. DN and DeltaSo vs. DN were found.