Published January 1, 2010
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Acid Dissociation Constants of Some Novel Isatin Thiosemicarbazone Derivatives
- 1. Eskisehir Osmangazi Univ, Fac Sci & Arts, Dept Chem, TR-26040 Eskisehir, Turkey
- 2. Kocaeli Univ, Fac Sci & Arts, Dept Chem, Izmit, Turkey
Description
The acid dissociation constants (pK(a)) of five novel biologically active isatin thiosemicarbazone derivatives were determined by a UV-visible spectrophotometric technique at (25 +/- 0.1) degrees C. The deprotonations for all studied molecules were found to occur at the substituted fa-amino group, whereas the protonation seems to take place at the oxo group of the five-membered ring.
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