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- W2018683896 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." @default.
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- W2018683896 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" @default.
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- W2018683896 doi "https://doi.org/10.1016/s0020-1693(00)88370-x" @default.
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