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Solution equilibria of pyridinecarboxylic acids: Complexation reaction of 2-mercaptonicotinic acid-copper (II) complex with thiosalicylic acid

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Abstract

The reaction of 2-mercaptonicotinic-copper (II) complex (Cu2+-MENA, 1 3n 1) with thiosalicylic acid (TSA) has been investigated spectrophotometrically in ethanol-water solution (50%, v/v) at I=O.IM (NaClO4) and 25°C. Under the acidic conditions encountered in this study, there are competing equilibria between protonation of the Cu2+-MENA binary chelate, the formation of the Cu(MENA)(TSA) ternary complex and protonation of the second ligand (TSA). The equilibrium constants for the complexation reactions and the stability of the mixed-ligand complex are determined. The optimum conditions for the predominance of the ternary complex are established and the enhancement of this complex over binary complex formation is evaluated. Complex-forming equilibria have also been examined by potentiometric-pH titrations and the experimental data are discussed in relation to various equilibria existing in solution. Structural and bonding features of the mixed-ligand complex are illustrated from considerations of the IR spectral data.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Assiut University, Assiut, Egypt

    Kamal A. Idriss, Magda S. Saleh, Mohamed M. Seleim & Elham Y. Hashem

Authors
  1. Kamal A. Idriss
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  2. Magda S. Saleh
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  3. Mohamed M. Seleim
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  4. Elham Y. Hashem
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Idriss, K.A., Saleh, M.S., Seleim, M.M. et al. Solution equilibria of pyridinecarboxylic acids: Complexation reaction of 2-mercaptonicotinic acid-copper (II) complex with thiosalicylic acid. J Solution Chem 22, 469–481 (1993). https://doi.org/10.1007/BF00647683

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  • DOI: https://doi.org/10.1007/BF00647683

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