Aminopolycarboxylates of rare earths. 16. Kinetics of metal ion-exchange reactions between cerium(III) meso- and racemic-2, 3-diaminobutane-N,N,N′,N′-tetraacetate complexes and the cobalt(II), nickel(II), copper(II) and lead(II) ions

G. Laurenczy, E. Brücher, V. Novák

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A spectrophotometric method was used to study the kinetics of the metal ion-exchange reactions between the complexes rac-Cedbta and meso-Cedbta and Pb2+, Cu2+, Co2+ or Ni2+. These exchange reactions proceed predominantly through proton- catalysed dissociation of the complexes. A minor role of the reaction involving direct attack by the ex- changing metal ion is observed only for meso. Cedbta. In the reactions with Co2+ and Ni2+, the proton-catalysed dissociations of rac-Cedbta and meso.Cedbta are to be considered as reversible processes; on the basis of the resulting rate equation, the rate constants may be calcu, lated for the formation reactions of the Co2+ and Ni2+ complexes. The rate constants for the dissociation of the complexes vary in the sequence rac-Cedbta<meso-Cedbta< Ceedta. This sequence is explained in terms of the spatial requirements of the methyl groups in the ligands rac-dbta and meso.dbta, the lower flexibility of the coordinated ligand, and the lower mobility of the functional groups relative to those in edta.

Original languageEnglish
Pages (from-to)147-155
Number of pages9
JournalInorganica Chimica Acta
Issue number1
Publication statusPublished - Oct 1 1987


ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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