On the Stability of the Acetate, Glycolate and Thioglycolate Complexes of Tervalent Europium and Americium.

Grenthe, Ingmar; Yhland, Margareta; Salmenperä, A.; Block-Bolten, A.; Toguri, J. M.; Flood, H.

doi:10.3891/acta.chem.scand.16-1695

Cited by 38 publications

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“…This confirms that only one complex of 1:1 stoichiometry is formed under these conditions for both EuPhbH 2+ and EuProtoH 2 2+ . The log 10 β 1 at the intercept values are summarized in Table 1 together with otherwise published data for similar complexes [7,9,24,[49][50][51][52][53][54][55][56].…”

Section: Complexation Constant Determinationmentioning

confidence: 99%

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Complexation of europium(III) by hydroxybenzoic acids: A time-resolved luminescence spectroscopy study

Moreau

Colette-Maatouk²,

Vitorge³

et al. 2015

Inorganica Chimica Acta

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Complexation of Eu(III) by two hydroxybenzoic acids, namely p-hydroxybenzoic acid (4-dihydroxybenzoic, HPhbH), and protocatechuic acid (3,4-dihydroxybenzoic, HProtoH 2 ), is studied by time-resolved luminescence spectroscopy (TRLS) in mildly acidic solution.Comparable formation constants are determined at 0.1 mol.L -1 NaCl for EuPhbH 2+log 10 β°(EuPhbH 2+ ) = 2.18  0.09 (1)and 0.01 mol.L -1 NaCl for EuProtoH 2 2+log 10 β°(EuProtoH 2 2+ ) = 2.72  0.07 (1). The stoichiometry and carboxylate complexation of the EuProtoH 2 2+ complex is ascertained by varying both pH and ligand concentration. The luminescence decay time of EuPhbH 2+ (τ = 107 ± 5 µs) is comparable with that of Eu(H 2 O) n 3+(τ = 110 ± 3 µs), suggesting that luminescence quenching processes compensate the expected increase in decay time due to the dehydration associated with complexation. For EuProtoH 2 2+ , the luminescence decay time is even shorter (τ = 20 ± 5 µs), evidencing intricate quenching processes.

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Section: Complexation Constant Determinationmentioning

confidence: 99%

“…[59], and requires the estimation of the value of ε(Eu 3+ ,A -). The compilation of Eu(III)-acetate [9,[49][50][51][52]54,56] and Am(III)-acetate [55] data from literature in SI gives log 10 β°(EuPhbH 2+ ) = 2.30 ± 0.09 and log 10 β°(EuProtoH 2 2+ ) = 2.73 ± 0.07.…”

Section: Complexation Constant Determinationmentioning

confidence: 99%

Complexation of europium(III) by hydroxybenzoic acids: A time-resolved luminescence spectroscopy study

Moreau

Colette-Maatouk²,

Vitorge³

et al. 2015

Inorganica Chimica Acta

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“…42 In this paper (Part I), both techniques have been applied for studying the complexation of Eu(III) as an analog of trivalent actinides by small organic ligands (AA, GA, and A4HPA) as model molecules for HS. The first two systems have been extensively studied by various techniques, the Eu-GA system by ion exchange, 43,44 electrochemistry, [45][46][47][48] or time-resolved laser-induced fluorescence spectrometry, 49 and the Eu-AA system by spectrophotometry, 50 ion exchange, 43,51 or electrochemistry, 48,52,53 which will allow comparisons. In the next publication, the methodology and results introduced in this paper will be applied to the study of the interactions between Eu(III) and humic substances by the same techniques (Part II).…”

Section: Introductionmentioning

confidence: 99%

On the Use of Spectroscopic Techniques for Interaction Studies, Part I: Complexation between Europium and Small Organic Ligands

et al. 2005

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In the framework of environmental studies, it is important to understand the interaction of humic substances with cations (heavy metals, radionuclides) and to determine their complexation constants in order to evaluate their potential impact on their fate. For this purpose, two techniques have been used: electrospray ionization mass spectrometry, a newly used technique in speciation studies, and time-resolved laser-induced fluorescence spectrometry, a well-known technique for such studies. As a first step, for simplification purposes and to compare both techniques, simple molecules having functional groups present in humic substances have been selected, such as acetic, glycolic, and 4-hydroxyphenylacetic acids. Both techniques have been used to obtain stoichiometries and complexation constants between these simple molecules and europium (III).

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“…Stability constants have been determined in the case of many rare-earth combinations with organic ligands. Stability constant sequences have been reported for acetate (12)(13)(14)(15)(16), glycolate (14,15,(17)(18)(19)(20)(21), methoxyacetate (17,22), thioglycolate (17,(22)(23)(24), and aminoacetate (17). As one replaces a hydrogen next to the carboxylate group, one finds that the order of stability enhancement is NHg > OH > OCEj » SH.…”

Section: Review Of Literature On the Rare-earth Complexesmentioning

confidence: 99%

The stability constants of rare-earths with some carboxylic acids

Schoeb

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On the Stability of the Acetate, Glycolate and Thioglycolate Complexes of Tervalent Europium and Americium.

Cited by 38 publications

References 0 publications

Complexation of europium(III) by hydroxybenzoic acids: A time-resolved luminescence spectroscopy study

Complexation of europium(III) by hydroxybenzoic acids: A time-resolved luminescence spectroscopy study

On the Use of Spectroscopic Techniques for Interaction Studies, Part I: Complexation between Europium and Small Organic Ligands

The stability constants of rare-earths with some carboxylic acids

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