Kinetics of the exchange reaction between neodymium (III) transcyclohexanediamine tetraacetate and aquo-ions of europium (III) and holmium (III) in H2O and D2O solutions
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Electrophilic substitution in the systems NdD−−Eu3+, NdD−−Ho3+ (D4− is cyclohexanediamine tetraacetate) is brought about by a dissociative mechanism catalyzed by protons and by a spontaneous dissociation mechanism. The decomposition of an intermediate protonated complex limits exchange by an acid-catalyzed mechanism.
An associative mechanism for electrophilic exchange is not realized in the systems studied.
KeywordsEuropium Exchange Reaction Neodymium Holmium Electrophilic Substitution
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