Abstract
The complexation of nickel(II), cobalt(III), copper(II) ions with 2-furan- and 2-thiophenecarbohydrazones of pyridoxal 5-phosphate in aqueous solutions was studied spectrophotometrically. The stoichiometries and conditional stability constants of the complexes at pH 7.4, T = 298.2 K, and I = 0.25 M were determined. In aqueous solutions, the coordination complexes under study contain one metal ion and two ligand molecules. For doubly charged metal cations, the conditional stability constants \(\log \beta _{2}^{'}\) lie in the range of 10.4–11, while those for Co(III) complexes lie in the range of 14.7–15.2. The influence of the nature of hydrazide residue on the stability of complexes of d-metal ions with hydrazones is found to be small. A preliminary analysis of the potential usefulness of the studied hydrazones as indicators of the presence of Co(III), Ni(II), Cu(II) ions in solutions is performed.
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This work was conducted at the Research Institute for Thermodynamics and Kinetics of Chemical Processes, Ivanovo State University of Chemistry and Technology, and supported by the Ministry of Science and Higher Education of the Russian Federation (project no. 4.7305.2017/8.9) and the Council for Grants of the President of the Russian Federation (project no. 14.Z56.18.877-MK).
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Translated by D. Terpilovskaya
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Zavalishin, M.N., Gamov, G.A., Khokhlova, A.Y. et al. Stability of Co(III), Ni(II), and Cu(II) Complexes with 2-Furan- and 2-Thiophenecarboxyhydrazones of Pyridoxal 5-Phosphate in Neutral Aqueous Solutions. Russ. J. Inorg. Chem. 65, 119–125 (2020). https://doi.org/10.1134/S0036023620010209
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DOI: https://doi.org/10.1134/S0036023620010209