Equilibrium and kinetic studies of the reactions of N-substituted (ethylenediamine-N,N',N'-triacetato)aquachromium(III) with several anions

Ogino, Hiroshi; Shimura, Makoto; TANAKA, N.

doi:10.1021/ic50199a033

Cited by 27 publications

(13 citation statements)

References 8 publications

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“…) and related complexes their anomalous substitutional lability (Guardalabene et al, 1979;Ogino et al, 1975Ogino et al, , 1979Ogino et al, , 1986Sulfab et al, 1976). The proposed mechanism for substitution in Cr[EDTA(H 2 O)]…”

Section: Speciation Of Chromium In Aqueous Solution: Chemical and Redmentioning

confidence: 99%

Effect of complexing agents on reduction of Cr(VI) by Desulfovibrio vulgaris ATCC 29579

Mabbett

Lloyd

Macaskie

2002

Biotech & Bioengineering

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The reduction of Cr(VI) at the expense of molecular hydrogen was studied using resting cells of Desulfovibrio vulgaris ATCC 29579 in anaerobic resting cell suspensions in MOPS buffer. Bioreduction occurred only in the presence of ligands or chelating agents (CO32-, citrate, NTA, EDTA, DTPA). The stimulatory effect of these ligands on the rate of Cr(VI) reduction was correlated (r = 0.988) with the strength of the ligand/chelate complex of Cr(III). The data are examined with respect to likely solution and redox equilibria in the ionic matrix of the carrier solution, and with respect to the potential for bioremediation of Cr(VI).

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Section: Speciation Of Chromium In Aqueous Solution: Chemical and Redmentioning

confidence: 99%

Effect of complexing agents on reduction of Cr(VI) by Desulfovibrio vulgaris ATCC 29579

Mabbett

Lloyd

Macaskie

2002

Biotech & Bioengineering

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“…This complexation has been applied to the elimination of toxic and carcinogenic Cr(VI) by the ultrafiltration techniques . The kinetics of the reactions of Cr(III) with EDTA and similar ligands have been studied both in the absence and in the presence of hydrogen peroxide . Although the Cr(III)–EDTA reaction under conditions of a large ligand/metal excess has so far been classified as a pseudo–first‐order reaction , some experimental results showing compelling evidence of deviations from this simple kinetic behavior have been found and will be presented here forth.…”

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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“…In the absence of N 2 H 4 X ϩ the ligand charge transfer between 240 and 250 nm and the ligand to metal charge transfer bands in the regions 280-290 and 360-370 nm were observed for all complexes. The absorption band at 360 nm, characteristic of a Ru-OH 2 bond, 36 was reduced in intensity on introduction of N 2 H 5 ϩ due to the replacement of bound water molecule by the latter. In the case of addition of N 2 H 4 Ph ϩ two new absorption bands at 400-450 and 540 nm appeared rapidly.…”

Section: Resultsmentioning

confidence: 99%

Ruthenium(III)–aminopolycarboxylato complexes active for the reduction of the N–N bond of hydrazine and phenylhydrazine in aqueous acidic media

Prakash

Ramachandraiah

2000

J. Chem. Soc., Dalton Trans.

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Equilibrium and kinetic studies of the reactions of N-substituted (ethylenediamine-N,N',N'-triacetato)aquachromium(III) with several anions

Cited by 27 publications

References 8 publications

Effect of complexing agents on reduction of Cr(VI) by Desulfovibrio vulgaris ATCC 29579

Effect of complexing agents on reduction of Cr(VI) by Desulfovibrio vulgaris ATCC 29579

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

Ruthenium(III)–aminopolycarboxylato complexes active for the reduction of the N–N bond of hydrazine and phenylhydrazine in aqueous acidic media

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