Aminopolycarboxylates of rare earths-VI. Determination of stability constants and formation enthalpies of rare earth(III)-Ethylenediamine tetraacetate-Fluoride mixed ligand complexes

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Abstract

Potentiometric examination with a fluoride-selective electrode of the Ln(edta)--F- systems indicate that mixed ligand complexes with composition (Ln(edta)F2- and Ln(edta)F23- are formed. The stability constants K1 increase with the atomic number up to Dy, and subsequently decrease. The stability constants K2 are small, their values being around 3 throughout the entire series. A 1H NMR spectroscopic study of the complexes of the diamagnetic elements showed that the methylene and ethylene protons are shifted in the direction of higher fields, which indicates an increase of the Ln3+-donor atom distances. The enthalpy changes connected with the formation of the complexes Ln(edta)F2- are essentially more exothermic than those found for the formation of the complexes LnF2+.

Original languageEnglish
Pages (from-to)345-349
Number of pages5
JournalJournal of Inorganic and Nuclear Chemistry
Volume43
Issue number2
DOIs
Publication statusPublished - 1981

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ethylenediamine
Fluorides
Rare earths
fluorides
Enthalpy
rare earth elements
enthalpy
Ligands
ligands
methylene
Protons
Ethylene
ethylene
examination
Nuclear magnetic resonance
Atoms
nuclear magnetic resonance
Electrodes
electrodes
protons

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title = "Aminopolycarboxylates of rare earths-VI. Determination of stability constants and formation enthalpies of rare earth(III)-Ethylenediamine tetraacetate-Fluoride mixed ligand complexes",
abstract = "Potentiometric examination with a fluoride-selective electrode of the Ln(edta)--F- systems indicate that mixed ligand complexes with composition (Ln(edta)F2- and Ln(edta)F23- are formed. The stability constants K1 increase with the atomic number up to Dy, and subsequently decrease. The stability constants K2 are small, their values being around 3 throughout the entire series. A 1H NMR spectroscopic study of the complexes of the diamagnetic elements showed that the methylene and ethylene protons are shifted in the direction of higher fields, which indicates an increase of the Ln3+-donor atom distances. The enthalpy changes connected with the formation of the complexes Ln(edta)F2- are essentially more exothermic than those found for the formation of the complexes LnF2+.",
author = "R. Kir{\'a}ly and I. T{\'o}th and E. Br{\"u}cher",
year = "1981",
doi = "10.1016/0022-1902(81)90021-X",
language = "English",
volume = "43",
pages = "345--349",
journal = "Polyhedron",
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publisher = "Elsevier Limited",
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TY - JOUR

T1 - Aminopolycarboxylates of rare earths-VI. Determination of stability constants and formation enthalpies of rare earth(III)-Ethylenediamine tetraacetate-Fluoride mixed ligand complexes

AU - Király, R.

AU - Tóth, I.

AU - Brücher, E.

PY - 1981

Y1 - 1981

N2 - Potentiometric examination with a fluoride-selective electrode of the Ln(edta)--F- systems indicate that mixed ligand complexes with composition (Ln(edta)F2- and Ln(edta)F23- are formed. The stability constants K1 increase with the atomic number up to Dy, and subsequently decrease. The stability constants K2 are small, their values being around 3 throughout the entire series. A 1H NMR spectroscopic study of the complexes of the diamagnetic elements showed that the methylene and ethylene protons are shifted in the direction of higher fields, which indicates an increase of the Ln3+-donor atom distances. The enthalpy changes connected with the formation of the complexes Ln(edta)F2- are essentially more exothermic than those found for the formation of the complexes LnF2+.

AB - Potentiometric examination with a fluoride-selective electrode of the Ln(edta)--F- systems indicate that mixed ligand complexes with composition (Ln(edta)F2- and Ln(edta)F23- are formed. The stability constants K1 increase with the atomic number up to Dy, and subsequently decrease. The stability constants K2 are small, their values being around 3 throughout the entire series. A 1H NMR spectroscopic study of the complexes of the diamagnetic elements showed that the methylene and ethylene protons are shifted in the direction of higher fields, which indicates an increase of the Ln3+-donor atom distances. The enthalpy changes connected with the formation of the complexes Ln(edta)F2- are essentially more exothermic than those found for the formation of the complexes LnF2+.

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U2 - 10.1016/0022-1902(81)90021-X

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