A kinetic study of the isotopic exchange of indium in indium N-2-hydroxyethylethylenediamine-N,N',N'-triacetate complex in water

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  • A kinetic study of the isotopic exchange of indium in indium N-2-hydroxyethylethylenediamine-N , N , N -triacetate complex in water

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<jats:title>Abstract</jats:title> <jats:p>1) The kinetics of the isotopic exchange of the indium EDTA-OH complex with uncomplexed indium has been studied in neutral and basic solutions, with 114mIn as tracer.</jats:p> <jats:p>2) The exchange rate is independent of the concentration of uncomplexed indium and proportional to that of the EDTA-OH complex, giving the relationship R=k·b.</jats:p> <jats:p>3) In a basic solution buffered by barbiturate, p-hydroxybenzoate, or ammonia, the k value is proportional to the concentration of hydroxide ions and is little affected by the buffer. The Arrhenius activation energy is 25 kcal. per mol., and a mechanism involving the dissociation of hydroxo complex [InZ·OH]− as the rate-determining step was postulated. The exchange is accelerated by glycine.</jats:p> <jats:p>4) In a neutral solution with a pH value below 8, the rate is small but measurable. It is independent of the pH value and is little affected by barbiturate or p-hydroxybenzoate, and the activation energy is 19 kcal. per mol. The dissociation of a mixed complex containing tartrate as one of the ligands, [InZ·C4H4O6]2−, appears to be the rate-determining step. Glycine accelerates the exchange reaction.</jats:p> <jats:p>5) The feature of the isotopic exchange of the indium EDTA-OH complex is quite different from that of the EDTA complex; the former seems to be much more labile than the latter and similar gallium complexes.</jats:p>

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