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Double-double effect and the coordination number

II. Mixed lanthanide(III) complexes of trans-1,2-diaminocyclohexanetetraacetic acid with iminodiacetate, glycine and hydroxide ions

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Abstract

The partial stability constants of the mixed complexes, Ln(III)-DCTA-L (where DCTA is trans-1,2-diaminocyclohexanetetraacetic acid and L, consecutively, OH−, glycine and iminodiacetate) have been determined potentiometrically at 25°C and at the ionic strength of 1 (KCl). It has been concluded that in the 1∶1 chelates, [(H2O)xLn(DCTA)]−, the number of water molecules decreases from 3 in the La−Sm range to 2 in the Dy−Lu one. The coordination numbers of the mixed complexes studied are discussed on the basis of the theory of the double-double effect. An explanation for the extrastability of the Ln(DCTA) chelates is given.

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Author notes

  1. T. Mioduski

    Present address: Department of Radiochemistry, Institute of Nuclear Research, 03-195, Warsaw, Poland

Authors and Affiliations

  1. Department of Analytical and Radiochemistry, University of Liège, Sart Tilman, B-4000, Liège, Belgium

    T. Mioduski

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  1. T. Mioduski
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Mioduski, T. Double-double effect and the coordination number. J. Radioanal. Chem. 53, 37–47 (1979). https://doi.org/10.1007/BF02517904

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  • DOI: https://doi.org/10.1007/BF02517904

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