Aminopolycarboxylates of rare earths. 15. Kinetic study of metal ion exchange reactions between cerium(III)-1,2-diaminopropane-N,N,N′,N′-tetraacetate complexes and cobalt(II), nickel(II), lead(II) and copper(II) ions

G. Laurenczy, E. Brücher

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Abstract

The rate of the exchange reactions occurring between the Cedpta- complex and Pb2+, Cu2+, Co2+ and Ni2+ ions generally increases with an increase in the concentration of the H+ and metal ions. The interpretation of the results was based on the assumption that the exchange reaction can take place either by the slow, proton-assisted dissociation of Cedpta-, followed by the fast reaction between the exchanging metal ion and the free ligand, or by direct attack by the metal ion on the Cedpta- complex and the protonated CeHdpta complex. The reaction between the Cedpta- and Pb2+ ions predominantly occurs through the fast formation of a dinuclear intermediate [CedptaPb]+, in which a carboxylate group is coordinated to the Pb2+, and the other functional groups of the ligand are progressively transferred from the Ce3+ to the Pb2+ ion. The values of the rate constants characteristic for the direct attack by Pb2+, Cu2+, Co2+ and Ni2+ are linearly proportional to the water exchange rate of these ions, indicating an exchange mechanism similar to that assumed for the exchange reactions of Ceedta-. In the reactions with Co2+ and Ni2+ ions, the free ligand formed by the proton-assisted dissociation of Cedpta- can react with the Ce3+ ions to form Cedpta- again, due to the lower water exchange rate of Ni2+ and Co2+. In these cases the rate constants of the formation reactions of Nidpta2- and Codpta2- can be calculated from the rate equation obtained for the exchange reactions.

Original languageEnglish
Pages (from-to)113-119
Number of pages7
JournalInorganica Chimica Acta
Volume127
Issue number1
DOIs
Publication statusPublished - Feb 16 1987

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Cerium
Ion Exchange
Cobalt
Nickel
cerium
Rare earths
Metal ions
Copper
metal ions
Ion exchange
cobalt
rare earth elements
Lead
Metals
nickel
Ions
copper
Kinetics
kinetics
ions

ASJC Scopus subject areas

  • Biochemistry
  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Materials Chemistry

Cite this

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title = "Aminopolycarboxylates of rare earths. 15. Kinetic study of metal ion exchange reactions between cerium(III)-1,2-diaminopropane-N,N,N′,N′-tetraacetate complexes and cobalt(II), nickel(II), lead(II) and copper(II) ions",
abstract = "The rate of the exchange reactions occurring between the Cedpta- complex and Pb2+, Cu2+, Co2+ and Ni2+ ions generally increases with an increase in the concentration of the H+ and metal ions. The interpretation of the results was based on the assumption that the exchange reaction can take place either by the slow, proton-assisted dissociation of Cedpta-, followed by the fast reaction between the exchanging metal ion and the free ligand, or by direct attack by the metal ion on the Cedpta- complex and the protonated CeHdpta complex. The reaction between the Cedpta- and Pb2+ ions predominantly occurs through the fast formation of a dinuclear intermediate [CedptaPb]+, in which a carboxylate group is coordinated to the Pb2+, and the other functional groups of the ligand are progressively transferred from the Ce3+ to the Pb2+ ion. The values of the rate constants characteristic for the direct attack by Pb2+, Cu2+, Co2+ and Ni2+ are linearly proportional to the water exchange rate of these ions, indicating an exchange mechanism similar to that assumed for the exchange reactions of Ceedta-. In the reactions with Co2+ and Ni2+ ions, the free ligand formed by the proton-assisted dissociation of Cedpta- can react with the Ce3+ ions to form Cedpta- again, due to the lower water exchange rate of Ni2+ and Co2+. In these cases the rate constants of the formation reactions of Nidpta2- and Codpta2- can be calculated from the rate equation obtained for the exchange reactions.",
author = "G. Laurenczy and E. Br{\"u}cher",
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doi = "10.1016/S0020-1693(00)88370-X",
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TY - JOUR

T1 - Aminopolycarboxylates of rare earths. 15. Kinetic study of metal ion exchange reactions between cerium(III)-1,2-diaminopropane-N,N,N′,N′-tetraacetate complexes and cobalt(II), nickel(II), lead(II) and copper(II) ions

AU - Laurenczy, G.

AU - Brücher, E.

PY - 1987/2/16

Y1 - 1987/2/16

N2 - The rate of the exchange reactions occurring between the Cedpta- complex and Pb2+, Cu2+, Co2+ and Ni2+ ions generally increases with an increase in the concentration of the H+ and metal ions. The interpretation of the results was based on the assumption that the exchange reaction can take place either by the slow, proton-assisted dissociation of Cedpta-, followed by the fast reaction between the exchanging metal ion and the free ligand, or by direct attack by the metal ion on the Cedpta- complex and the protonated CeHdpta complex. The reaction between the Cedpta- and Pb2+ ions predominantly occurs through the fast formation of a dinuclear intermediate [CedptaPb]+, in which a carboxylate group is coordinated to the Pb2+, and the other functional groups of the ligand are progressively transferred from the Ce3+ to the Pb2+ ion. The values of the rate constants characteristic for the direct attack by Pb2+, Cu2+, Co2+ and Ni2+ are linearly proportional to the water exchange rate of these ions, indicating an exchange mechanism similar to that assumed for the exchange reactions of Ceedta-. In the reactions with Co2+ and Ni2+ ions, the free ligand formed by the proton-assisted dissociation of Cedpta- can react with the Ce3+ ions to form Cedpta- again, due to the lower water exchange rate of Ni2+ and Co2+. In these cases the rate constants of the formation reactions of Nidpta2- and Codpta2- can be calculated from the rate equation obtained for the exchange reactions.

AB - The rate of the exchange reactions occurring between the Cedpta- complex and Pb2+, Cu2+, Co2+ and Ni2+ ions generally increases with an increase in the concentration of the H+ and metal ions. The interpretation of the results was based on the assumption that the exchange reaction can take place either by the slow, proton-assisted dissociation of Cedpta-, followed by the fast reaction between the exchanging metal ion and the free ligand, or by direct attack by the metal ion on the Cedpta- complex and the protonated CeHdpta complex. The reaction between the Cedpta- and Pb2+ ions predominantly occurs through the fast formation of a dinuclear intermediate [CedptaPb]+, in which a carboxylate group is coordinated to the Pb2+, and the other functional groups of the ligand are progressively transferred from the Ce3+ to the Pb2+ ion. The values of the rate constants characteristic for the direct attack by Pb2+, Cu2+, Co2+ and Ni2+ are linearly proportional to the water exchange rate of these ions, indicating an exchange mechanism similar to that assumed for the exchange reactions of Ceedta-. In the reactions with Co2+ and Ni2+ ions, the free ligand formed by the proton-assisted dissociation of Cedpta- can react with the Ce3+ ions to form Cedpta- again, due to the lower water exchange rate of Ni2+ and Co2+. In these cases the rate constants of the formation reactions of Nidpta2- and Codpta2- can be calculated from the rate equation obtained for the exchange reactions.

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