Dissociation Kinetics of TMDTA and TMEDTA Complexes of Lanthanides
- 1 July 1991
- journal article
- research article
- Published by Taylor & Francis in Journal of Coordination Chemistry
- Vol. 24 (1) , 19-28
- https://doi.org/10.1080/00958979109409732
Abstract
The dissociation kinetics of TMDTA (trimethylenedinitrilotetraacetic acid) and TMEDTA (tetramethyl-enedinitrilotetraacetic acid) complexes of Ce(III), Eu(III), and Yb(III) ions have been studied in aqueous solution using Cu(II) ions as the scavenger in acetate buffer (I = 0.1 M) at 25°C. All the complexes exhibit acid-dependent and acid-independent pathways in a manner similar to LnDCTA− complexes. The buffer concentration dependence of the rate of dissociation has also been investigated. The rates of dissociation of LnTMDTA− and LnTMEDTA− complexes are much faster than those of LnEDTA− complexes. The chelate ring size effect is discussed by comparing the rate constants to those of analogous EDTA and DCTA systems.Keywords
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