Solution structure of the chromium(III) complex with EDTA by deuteron NMR spectroscopy

Wheeler, William D.; Legg, J. Ivan

doi:10.1021/ic00191a026

Cited by 40 publications

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“…The chemical structure of the Cr(III)–EDTA complex has been the objective of some spectroscopic research , and quantitative determinations of its acid–base properties have also been reported . This complexation has been applied to the elimination of toxic and carcinogenic Cr(VI) by the ultrafiltration techniques .…”

Section: Introductionmentioning

confidence: 99%

Two Rate Constant Kinetic Model for the Chromium(III)–EDTA Complexation Reaction by Numerical Simulations

Perez‐Benito

2017

Int J of Chemical Kinetics

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The complexation reaction of Cr(III) ion in the presence of a large excess of ethylenediaminetetraacetic acid (EDTA) does not follow a pseudo–first‐order kinetics as sometimes suggested. There are two causes for the deviation from this simple behavior: the involvement of a long‐lived intermediate, precluding the application of the steady‐state approximation, and the autoinhibition provoked by the release of hydrogen ions from the organic ligand to the medium as the final Cr(III)–EDTA violet complex is formed. Numerical simulations have allowed obtaining for each kinetic experiment the values of two rate constants, k1 (corresponding to the formation of the long‐lived intermediate from the reactants) and k2 (corresponding to the formation of the final complex product from the long‐lived intermediate), as well as the number of hydrogens liberated per molecule of final complex product formed (Hkin). The results indicate that k1 is associated with a fast step (Ea = 87 ± 4 kJ mol−1) and k2 to a slow step (Ea = 120 ± 2 kJ mol−1), whereas the number of hydrogen ions lies within the range 0 < Hkin < 2 in all the kinetic runs. A mechanism in accordance with the experimental data has been proposed.

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Section: Introductionmentioning

confidence: 99%

Two Rate Constant Kinetic Model for the Chromium(III)–EDTA Complexation Reaction by Numerical Simulations

Perez‐Benito

2017

Int J of Chemical Kinetics

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“…According to the NMR spectroscopy data [53] ethylenediaminetertaacetate (EDTA 4À ) forms a hexadentate complex with Cr(III) between pH 3.5 and 6.5. The same conclusion was reached in Ref.…”

Section: Discussionmentioning

confidence: 99%

Misleading aspects of the viscosity effect on the heterogeneous electron transfer reactions

Nazmutdinov¹,

Tsirlina²,

Manyurov³

et al. 2006

Chemical Physics

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“…However, there are several reports based on Raman spectroscopy, infrared spectroscopy, deuterium NMR, and circular dichroism studies, which suggest that the chromium(III) EDTA complex is coordinatively saturated by ligand donor atoms in slightly acidic media [26,[29][30][31]. X-ray studies of the K[Cr(III)EDTA] AE 2H 2 O synthesized at pH 5 show octahedral coordination of the metal by the ligand [32]; however, studies of the complex prepared by the method of Hamm [33,34] showed a monoclinic crystal system with a quinquedentate ligand with a protonated carboxylate and one water molecule in the first coordination sphere.…”

Section: Discussionmentioning

confidence: 99%

Chromium(III) complexes as intermolecular probes

Diakova

Fuller

Victor

et al. 2005

Journal of Magnetic Resonance

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Solution structure of the chromium(III) complex with EDTA by deuteron NMR spectroscopy

Cited by 40 publications

References 0 publications

Two Rate Constant Kinetic Model for the Chromium(III)–EDTA Complexation Reaction by Numerical Simulations

Two Rate Constant Kinetic Model for the Chromium(III)–EDTA Complexation Reaction by Numerical Simulations

Misleading aspects of the viscosity effect on the heterogeneous electron transfer reactions

Chromium(III) complexes as intermolecular probes

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