Kinetics of ligand exchange between 2-thenoyltrifluoroacetone and zirconium-lactate solution in weakly acidic lactate buffers

Chakravorty, D.; Ghosh, Rina; Banerjee, Rupendranath; Sarkar, Diptabhas

doi:10.1016/j.poly.2009.02.018

Cited by 3 publications

(12 citation statements)

References 17 publications

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“…Two important differences with our previous work [6] (catalyzed) term and a proton-independent (uncatalyzed) term. This evidently arises from less stability of the zirconium-lactate-acetylacetonate than zirconiumlactate-2-thenoyltrifluoroacetonate.…”

Section: Methodscontrasting

confidence: 63%

“…• C. It is interesting to note that the K value measured for the reaction of zirconium-lactate with 2-thenoyltrifluoroacetone is larger (K = 3.2) [6].…”

Section: Reaction Between Zirconium-lactate and Hamentioning

confidence: 98%

“…Zirconium-lactate solutions were prepared as reported earlier [6]. A clear solution of 0.9415 g of ZrOCl 2 .8H 2 O in 1.0 mL water was stirred with 1.753 M of refluxed lactic acid (90%).…”

Section: Experimental Materialsmentioning

confidence: 99%

“…Lactic acid solutions were distilled, prepared, and standardized as described earlier [6,8,9]. Solution pHs were measured with a pH meter (Toshniwal, CL-54), and calibrated using standard buffers.…”

Section: Experimental Materialsmentioning

confidence: 99%

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Kinetics and mechanism of reaction between zirconium‐lactate and pentane‐2,4‐dione in excess lactate

Ghosh

Banerjee

Sarkar

2011

Int J of Chemical Kinetics

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The kinetics of the reaction of pentane‐2,4‐dione (HA) with ZrIV has been studied at 25.0°C in an excess lactate (L−) media. The equilibrium reaction was found to be: Zr2L6+HA⇌HL+Zr2AL5. The equilibrium was approached from either direction and a plausible mechanism has been proposed with kinetic constants, but individual reactivities of the keto and the enol tautomers of pentane‐2,4‐dione could not be apportioned. However, it was found that both the uncatalyzed and acid‐catalyzed paths contribute to the reverse reaction. But 2‐thenoyltrifluoroacetone (HT) forms a stronger chelate with ZrIV, so its reaction with less reactive Zr2L5(OH2) 2+ could not be detected; reactivity of the more reactive Zr2L5(OH2)(OH) could be found. © 2011 Wiley Periodicals, Inc. Int J Chem Kinet 43: 725–729, 2011

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Section: Methodscontrasting

confidence: 63%

“…• C. It is interesting to note that the K value measured for the reaction of zirconium-lactate with 2-thenoyltrifluoroacetone is larger (K = 3.2) [6].…”

Section: Reaction Between Zirconium-lactate and Hamentioning

confidence: 98%

“…Zirconium-lactate solutions were prepared as reported earlier [6]. A clear solution of 0.9415 g of ZrOCl 2 .8H 2 O in 1.0 mL water was stirred with 1.753 M of refluxed lactic acid (90%).…”

Section: Experimental Materialsmentioning

confidence: 99%

Section: Experimental Materialsmentioning

confidence: 99%

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Kinetics and mechanism of reaction between zirconium‐lactate and pentane‐2,4‐dione in excess lactate

Ghosh

Banerjee

Sarkar

2011

Int J of Chemical Kinetics

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“…They studied the ligand exchange between 2-thenoyltrifluoroacetone and lactate bound to zirconium by UV absorption spectrophotometry. 18 This technique is very easy to use and is a powerful tool for equilibrium analysis of simple chemical systems.…”

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confidence: 99%

Ligand Exchange Reactions of a Monomeric Zirconium Carbonate Complex with Carboxylic Acids Studied by Extended X-ray Absorption Fine Structure, UV Absorption and Raman Spectrophotometry

et al. 2017

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Ligand exchange reactions of a monomeric zirconium carbonate complex with carboxylic acids were studied by means of extended X-ray absorption fine structure (EXAFS), UV absorption spectrophotometry and Raman spectrometry. Three carboxylic acids, gluconic acid, and L-tartaric acid and citric acid, which are mono-, di-and tri-carboxylic acids, respectively, were employed in this study. These three carboxylic acids gave different spectral signatures and concentration dependences, respectively. In the gluconic acid system, the peaks on Fourier transform of EXAFS spectrum and Raman spectrum caused by carbonate ion coordinating to zirconium atom were obviously decreased with increasing gluconic acid concentration compared to the other two carboxylic acid systems. This indicates the high association ability of gluconic acid to zirconium, which was revealed by UV spectrophotometric analysis.

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Utility of Interchangeable Coordination Modes of N,N′-Dialkyl-2,6-pyridinediamide Tridentate Pincer Ligands for Solvent Extraction of Pd(II) and Zr(IV) from High-Level Radioactive Liquid Waste

Orino,

Cao,

Tashiro

et al. 2024

Inorg. Chem.

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A new class of ligands, N,N′-dialkyl-2,6-pyridinediamide (DRPDA), has been designed with the specific intention of exhibiting interchangeable diversity in coordination modes, including organometallic interactions, for the purpose of solvent extraction of elements relevant to the proper treatment of highlevel radioactive liquid waste (HLLW) generated after nuclear fuel reprocessing. Consequently, DRPDA has been observed to extract Pd(II) and Zr(IV) from HNO 3 (aq) to 1-octanol in nearly quantitative yields when the selected ligand is sufficiently hydrophobic. However, concomitance of some of other HLLW components were also found. The extraction selectivity toward Pd(II) and Zr(IV) was markedly enhanced by employing ndodecane instead of 1-octanol as evidenced by good distribution ratios (D M ) of Pd(II) (D Pd = 72.5) and Zr(IV) (D Zr = 12.9), which is several orders of magnitude greater than D M 's of other HLLW components (10 −3 −10 −2 ), where addition of 20 vol % 1-octanol is still required to accelerate the extraction kinetics. Despite direct contact with the highly acidic aqueous phase, deprotonation from one of the amide NH moieties of DRPDA proceeds to form [Pd(DRPDA − )(NO 3 )] as a good extractables in the current biphasic system. This Pd(II) complex with a rather unique asymmetric N − ^N^O tridentate coordination was characterized by SCXRD, elemental analysis and 1 H NMR, and theoretically corroborated by DFT calculations and NBO analysis. In contrast, DRPDA also interacts with Zr 4+ in different tridentate O^N^O mode without any deprotonation. Based on mechanistic differences in the extraction chemistry we clarified, Pd(II) and Zr(IV) coextracted to the organic phase were recovered stepwise by using appropriate stripping agents such as 1.0 M HCl(aq) and 0.10 M HNO 3 (aq), respectively.

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Kinetics of ligand exchange between 2-thenoyltrifluoroacetone and zirconium-lactate solution in weakly acidic lactate buffers

Cited by 3 publications

References 17 publications

Kinetics and mechanism of reaction between zirconium‐lactate and pentane‐2,4‐dione in excess lactate

Kinetics and mechanism of reaction between zirconium‐lactate and pentane‐2,4‐dione in excess lactate

Ligand Exchange Reactions of a Monomeric Zirconium Carbonate Complex with Carboxylic Acids Studied by Extended X-ray Absorption Fine Structure, UV Absorption and Raman Spectrophotometry

Utility of Interchangeable Coordination Modes of N,N′-Dialkyl-2,6-pyridinediamide Tridentate Pincer Ligands for Solvent Extraction of Pd(II) and Zr(IV) from High-Level Radioactive Liquid Waste

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