Abstract
The spectral and calorimetric data on complex formation between alkyl substituted a,c-biladiene and Ni(II), Cu(II), Zn(II), Cd(II), and Hg(II) acetates in dimethylformamide are discussed. The stability of mononuclear biladiene chelates was shown to be determined by steric factors characterizing the formation of coordination polyhedra with the tetradentate ligand. The thermodynamic characteristics of the differential polychelate effect caused by the replacement of the bidentate dipyrrolylmetene ligand with the tetradentate biladiene anion in mononuclear zinc(II) complexes were estimated. The results showed that the largest contribution to the polychelate effect was made by the enthalpy component of the Gibbs energy.
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Original Russian Text © S.P. Makarova, E.V. Rumyantsev, E.V. Antina, 2008, published in Zhurnal Fizicheskoi Khimii, 2008, Vol. 82, No. 12, pp. 2255–2259.
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Makarova, S.P., Rumyantsev, E.V. & Antina, E.V. The thermodynamic characteristics of formation of mono-and binuclear biladiene Ni(II), Cu(II), Zn(II), Cd(II), and Hg(II) chelates in dimethylformamide solutions. Russ. J. Phys. Chem. 82, 2030–2034 (2008). https://doi.org/10.1134/S0036024408120108
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DOI: https://doi.org/10.1134/S0036024408120108