Spectroscopic and thermodynamic studies of complexation of some divalent metal ions with isatin-<Emphasis Type="Italic">β</Emphasis>-thiosemicarbazone |
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Authors: | S S Konstantinovi? B C Radovanovi? Z B Todorovi? S B Ili? B V Konstantinovi? |
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Institution: | (1) Faculty of Technology, University of Niš, Bulevar Osloboenja 124, 16000 Leskovac, Serbia;(2) Department of Chemistry, Faculty of Natural Sciences and Mathematics, University of Niš, Višegradska 33, 18000 Niš, Serbia;(3) Aura d.o.o., Vazduhoplovaca bb, 18000 Niš, Serbia |
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Abstract: | Metal complexes of some divalent metal ions (Co, Ni, Cu, Zn, Hg, and Pd) with isatin-β-thiosemicarbazone (ITS) as the Schiff base have been investigated potentiometrically and spectrophotometrically. The dissociation
constants of the ligand and formation constants of the metal complexes, as well as the corresponding thermodynamic functions
(ΔG, ΔH and ΔS) have been determined at different temperatures in ethanol—water solution. The full stability constants were also evaluated
spectrophotometrically by the Job method. The experimental results indicate that Cu(II), Zn(II), Pd(II), and Hg(II) form one-to-one
molecular complexes (ML) with the studied ligand, whereas Co(II) and Ni(II) form both ML and ML2 species. |
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Keywords: | isatin-β -thiosemicarbazone divalent metal complexes formation constant spectrophotometric study |
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