The Stability of the Rare Earth Complexes with N-Hydroxyethylethylenediaminetriacetic Acid

Spedding, F. H.; Powell, J.E.; Wheelwright, E.J.

doi:10.1021/ja01582a007

Cited by 83 publications

(27 citation statements)

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“…static attraction. The behaviour observed in these ligands agrees very well with that of other chelating agents (13)(14)(15). On the other hand, the formation constants (log K,) of the heavier lanthanide complexes (Tb3+ to Lu3+) show a very slight increase (Fig.…”

Section: Lu) As a Results Of Complex Formationsupporting

confidence: 82%

“…A literature (14,17,23) survey showed that the lanthanides can form 1: 1, 1 :2, and 1:3 complexes with P-diketones, but in this study only 1 : 1 and 1:2 types were obtained. This may be due to steric effects of the ligands which hinder interaction of the ligands around the metal ions.…”

Section: Lu) As a Results Of Complex Formationcontrasting

confidence: 51%

“…In terms of electrostatic considerations, the gadolinium break may be attributed to the discontinuity of the crystal radius at gadolinium (16). The deviation of the ligand stability constants from linearity is not peculiar, but seems to be common for most rare earth complexes with several chelating agents, such as 2,4-pentanedione (17), 1 -phenyl-1,3 -butane dione (18) and N-hydroxyethylenediamine triacetic acid (14).…”

Section: Lu) As a Results Of Complex Formationmentioning

confidence: 99%

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Formation constants of trivalent lanthanide metal ions and hydrazone β-diketones in 75% dioxane – water solvent

El‐Shetary¹,

Stefan²,

Abdel-Moez³

et al. 1988

Can. J. Chem.

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A new series of hydrazone P-diketone organic ligands were prepared: 3-(2-acetylpheny1hydrazone)pentane-2,4-dione (2-APHA), 2-(2-acetylpheny1hydrazone)-1-phenyl-1,3-butane dione (2-APHB), 2-(2-acetylpheny1hydrazone)-1,3-diphenyl-1,3-propane dione (2-APHDB), 3-(2-acetylphenylhydrazone) 1,1,1-trifluoropentane-2,4-dione (2-APHTA) and 2-(2-acetylpheny1hydrazone)-5,5-dimethyl-1,3-cyclohexane dione (2-APHDm). The step formation constants of their 1:l and 1:2 rare-earth complexes were determined at 30°C by pH titration in 75% (v/v) dioxane-water solvent. The ionization constant of ligands were also measured. A curious odd-even stability differential was apparent in the (2-APHDm) ligand with the heavier rare earths Gd-Lu. The differential was apparent in both log K , and log P values and may be sufficient to cause reversal of the usual ion-exchange elution sequence. On a prCparC une nouvelle skrie de ligands organiques dCrivts d'hydrazones de P-dicttones : (acCtyl-2 phCny1hydrazone)-3 pentanedione-2,4 (2-APHA), (acCtyl-2 phCny1hydrazone)-2 phtnyl-1 butanedione-1,3 (2-APHB), (acttyl-2 phCny1hydrazone)-2 diphCnyl-1,3 propanedione-1,3 (2-APHDB), (acCtyl-2 phtny1hydrazone)-3 trifluoro-1 , 1 , 1 pentanedione-2,4 (2-APHTA) et (acCtyl-2 phCny1hydrazone)-2 dimkthyl-5,5 cyclohexanedione-1,3 (2-APHDm). Operant a 30°C, dans un mClange dioxanneleau i 75% (v/v), on a dCterminC les constantes de formation par ttape de leurs complexes I: 1 et 1:2 avec des terres rares. On a aussi mesurC la constante d'ionisation des ligands. On a determink qu'il existe une curieuse de stabilitt diffkrentielle dans les complexes pair et impair du ligand 2-APHDm avec les terres rares plus lourdes de la strie Gd a Lu. On peut remarquer les differences tant dans les valeurs du log K , que du log P et ces differences sont telles qu'elles peuvent &tre suffisantes pour renverser la stquence habituelle d'Clution lors de l'tchange d'ions.[Traduit par la revue] P-Diketones are well-known chelating agents, capable of forming stable complexes with metal ions. Lanthanide Pdiketones have also been found to have wide application (2), including chromatographic separation of the lanthanide series (3). Azo compounds are also used as complexing agents (4), and the combination of azo compounds and P-diketones are good ligands (5). The chelation between similar ligands and lanthanide metal has been studied (6, 7).The coupling product of the diazonium salt of 2-aminoacetophenone with-different P-diketones such as acetylacetone, benzoylacetone, dibenzoyl methane, trifluoroacetylacetone, and 5,5-dimethylcyclohexane-1,3-dione (dimedone) produces a series of 3-(2-acetylphenylhydrazone)diketone ligands. T h e present study determined the acid dissociation constants of these ligands and the formation constants of their trivalent lanthanide complexes. The structure and basicity effects of the ligands on the stability of the formed complexes are discussed and some correlations attempted. These complexing agents may be useful in the separation of the lanthanides. Experimental (i) Ma...

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Section: Lu) As a Results Of Complex Formationsupporting

confidence: 82%

Section: Lu) As a Results Of Complex Formationcontrasting

confidence: 51%

Section: Lu) As a Results Of Complex Formationmentioning

confidence: 99%

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Formation constants of trivalent lanthanide metal ions and hydrazone β-diketones in 75% dioxane – water solvent

El‐Shetary¹,

Stefan²,

Abdel-Moez³

et al. 1988

Can. J. Chem.

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“…Ion exchange separation of rare earth elements was initiated by Spedding and Powell to separate fission products obtained from nuclear reactors (Spedding et al 1956;Powell, 1961Powell, , 1964. For several years the cation exchange was the primary method used to obtain individual lanthanides(III).…”

Section: Cation Exchangementioning

confidence: 99%

“…Using a solution of EDTA at higher pH values the separation process is carried out with a cupric-ion retaining bed. Of the ions proposed by Spedding, Krumholz and Powell the most relevant retaining ions are Cu(II) and Zn(II) (Spedding et al 1956;Powell, 1961).…”

Section: Cation Exchangementioning

confidence: 99%

Investigation of Sorption and Separation of Lanthanides on the Ion Exchangers of Various Types

Kołodyńska¹,

Hubicki²

2012

Ion Exchange Technologies

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Enthalpy and entropy changes associated with the ionization of hydroxyethylenediaminetriacetic acid

Fuger

Merciny

1968

Bulletin des Soc Chimique

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Enthalpy ck anges associated with the three ionizations of hydroxyethylenediarninetriacetic acid have been measured calorimetrically. The values reported for 25°C and p = 0.1 (KCI) are AH1 = -1.12&0.12, AH2 = +3.09&0.05 and AH3 = +6.65 h0.08 kcal.mole-l, respectively. From these data and from the acid dissociation constants, entropy changes are calculated. The results are compared with literature data obtained by the determination as a function of temperature of the acid dissociation constants.

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The Stability of the Rare Earth Complexes with N-Hydroxyethylethylenediaminetriacetic Acid

Cited by 83 publications

References 0 publications

Formation constants of trivalent lanthanide metal ions and hydrazone β-diketones in 75% dioxane – water solvent

Formation constants of trivalent lanthanide metal ions and hydrazone β-diketones in 75% dioxane – water solvent

Investigation of Sorption and Separation of Lanthanides on the Ion Exchangers of Various Types

Enthalpy and entropy changes associated with the ionization of hydroxyethylenediaminetriacetic acid

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