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Potentiometric and Thermodynamic Studies of Azosulfonamide Drugs

Al-Sarawy A., El-Bindary A., El-Sonbati A., Mokpel M.

Polish Journal of Chemistry

2006

Vol. 80, nr 2

289-295

The dissociation constants of azosulfonamide derivatives of rhodanine have been determined potentiometrically in 0.1 M-KCl and 10 vol. % DMF-water mixture. The data are discussed in terms of electron nature of the substituents and of the change in temperature. The pK1 H values have been found to increase with increasing electron-donating nature of the substituents. The evaluated thermodynamic parameters (delatG, deltaH, and deltaS) indicated that the dissociation processes are not spontaneous; they are endothermic and entropically unfavourable.