Kinetics and Mechanism of Interaction between Chromium(III) and Ethylenediaminetetra-3-Propinate in Aqueous Acidic Media

Abdel-Messih, M. F.

doi:10.4236/aces.2013.31012

Cited by 2 publications

(1 citation statement)

References 23 publications

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“…In the work now presented, some deviations from the one rate constant kinetic model reported for the Cr(III)‐amino acid complexation reactions have been observed. This kind of kinetic deviations might also affect the reactions of Cr(III) with picolinic acid, EDTA, and other similar organic ligands . As will be shown hereafter for the particular case of the complexation of Cr(III) with l ‐glutamic acid, a mathematical model involving two rate constants might be a better alternative to study the kinetics of these reactions.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of the chromium(III)/l‐glutamic acid complexation reaction: Formation, decay, and UV‐vis spectrum of a long‐lived intermediate

Perez‐Benito

Nicolas‐Rivases

2018

Int J of Chemical Kinetics

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The kinetics of the aqueous reaction of Cr(III) with either L-glutamic acid or sodium hydrogen L-glutamate at pH 2.46-5.87 have been followed by means of absorbance readings. The rate of formation of the reaction products showed accelerationdeceleration periods, caused by the accumulation and posterior decay of an intermediate in nonnegligible concentration. A double-exponential integrated rate law allowed obtaining two rate constants for each absorbance-time experimental series, associated with the appearance (k 1 ) and decay (k 2 ) of the long-lived intermediate. An increase of the initial concentrations of either hydrogen L-glutamate (apparent kinetic orders < 1) or hydroxide (kinetic orders = 1) ions resulted in an increase of both k 1 and k 2 , but addition of an inert electrolyte (KNO 3 ) resulted in opposite effects on k 1 (decrease) and k 2 (increase). The experimental activation energies were 83 ± 10 (for k 1 ) and 95 ± 5 (for k 2 ) kJ mol −1 . The electronic spectrum of the low reactivity detected intermediate resembled more closely to that of the blue/green reactant than that of the violet reaction product. The low number of protons set free by the complexating hydrogen L-glutamate ligand seems to suggest that some polymerization of the coordinated amino acid (to form a di-or tripeptide) might take place. The available experimental data indicate that the coordination of the organic ligand must be preceded by the breakdown of a strong Cr(III)-H 2 O chemical bond in the slow steps of the mechanism. K E Y W O R D S chromium(III), complexation reaction, kinetics, L-glutamic acid, long-lived intermediate Int J Chem Kinet. 2018;50:591-603. PEREZ-BENITO AND NICOLAS-RIVASES

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Section: Introductionmentioning

confidence: 99%

Kinetics of the chromium(III)/l‐glutamic acid complexation reaction: Formation, decay, and UV‐vis spectrum of a long‐lived intermediate

Perez‐Benito

Nicolas‐Rivases

2018

Int J of Chemical Kinetics

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Kinetics and Mechanism of Interaction of cis-Diaquabis(oxalato)chromate(III) with Cefoperazone in Aqueous Medium: as an Antibacterial Study

Behera

2018

J Pharm Innov

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Kinetics and Mechanism of Interaction between Chromium(III) and Ethylenediaminetetra-3-Propinate in Aqueous Acidic Media

Cited by 2 publications

References 23 publications

Kinetics of the chromium(III)/l‐glutamic acid complexation reaction: Formation, decay, and UV‐vis spectrum of a long‐lived intermediate

Kinetics of the chromium(III)/l‐glutamic acid complexation reaction: Formation, decay, and UV‐vis spectrum of a long‐lived intermediate

Kinetics and Mechanism of Interaction of cis-Diaquabis(oxalato)chromate(III) with Cefoperazone in Aqueous Medium: as an Antibacterial Study

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