Repozytorium
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Kolekcje
Inne
Complexes of Yb3+ with EDTA and CDTA - molecular and electronic structure.
Autorzy
Rok wydania
2008
Czasopismo
European Journal of Inorganic Chemistry
Strony
3075-3082
DOI
10.1002/ejic.200800249
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Two Yb3+ compounds, [C(NH2)3]2[Yb(EDTA)(H2O)2]ClO4·6H2O and [C(NH2)3][Yb(CDTA)(H2O)2]·4H2O, where EDTA is the ethylenediaminetetraacetate anion and CDTA is the trans-1,2-diaminecyclohexane-N,N,N′,N′-tetraacetate anion, were obtained and their crystal structures and spectroscopic properties were determined. In both compounds, the coordination geometries of the eight-coordinate Yb3+ ion are very similar. In each case, the inner sphere of the metal ion consists of four carboxyl oxygen atoms, two nitrogen atoms and two water molecules. The complexes were characterized by UV/Vis/NIR absorption at different temperatures and IR spectroscopy. The spectroscopic results revealed high sensitivity of the electronic 4f13 configuration upon minor changes in the coordination geometry around the Yb3+ ion. These data also demonstrate that species present in solutions of Yb3+–EDTA are similar to those found in the crystal, whereas in solutions of Yb3+–CDTA an equilibrium between at least two different forms exists. For the Yb3+–EDTA complex in solution and in the crystalline state, a charge-transfer transition was detected. Theoretical calculations revealed its complicated (Yb → ligand and ligand → Yb) character.
Słowa kluczowe
X-ray diffraction, Absorption, Density functional calculations, N, O ligands, Ytterbium
Adres publiczny
https://doi.org/10.1002/ejic.200800249
Strona internetowa wydawcy
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