Thermal evolution and luminescence properties of Zn-Al-layered double hydroxides containing europium(III) complexes of ethylenediaminetetraacetate and nitrilotriacetate / Cang Li in Industrial & engineering chemistry research, Vol. 48 N°4 (Février 2009)

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - p. 2162–2171 Titre : Thermal evolution and luminescence properties of Zn-Al-layered double hydroxides containing europium(III) complexes of ethylenediaminetetraacetate and nitrilotriacetate Type de document : texte imprimé Auteurs : Cang Li, Auteur ; Lianying Wang, Auteur ; David G. Evans, Auteur Année de publication : 2009 Article en page(s) : p. 2162–2171 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Ethylenediaminetetraacetate Nitrilotriacetate Layered double hydroxides Résumé : Europium complexes of ethylenediaminetetraacetate (EDTA) and nitrilotriacetate (NTA), [Eu(EDTA)(H2O)3]−, and [Eu(NTA)2(H2O)]3−, which have similar geometries but different charge densities, have been incorporated in Zn−Al layered double hydroxides (LDHs). The orientation and loading of the guest anions as well as their thermal stability and reorientation behavior are significantly influenced by their charge density. The maximal dimension of the [Eu(EDTA)(H2O)3]− anion is nearly perpendicular to the LDH layers and a reversible reorientation occurs on mild heating. The structural changes that occurred on heating were followed by variable temperature photoluminescence (PL) measurements. The kinetics of the structural transformation of ZnAl-Eu(EDTA) LDH in the temperature range 30−150 °C have also been studied. In the case of [Eu(NTA)2(H2O)]3−, the anion adopts a flat orientation in the interlayer galleries with its maximum dimension nearly parallel to the metal hydroxyl layers and no reorientation is observed on heating. [article] Thermal evolution and luminescence properties of Zn-Al-layered double hydroxides containing europium(III) complexes of ethylenediaminetetraacetate and nitrilotriacetate [texte imprimé] / Cang Li, Auteur ; Lianying Wang, Auteur ; David G. Evans, Auteur . - 2009 . - p. 2162–2171. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - p. 2162–2171 Mots-clés : Ethylenediaminetetraacetate Nitrilotriacetate Layered double hydroxides Résumé : Europium complexes of ethylenediaminetetraacetate (EDTA) and nitrilotriacetate (NTA), [Eu(EDTA)(H2O)3]−, and [Eu(NTA)2(H2O)]3−, which have similar geometries but different charge densities, have been incorporated in Zn−Al layered double hydroxides (LDHs). The orientation and loading of the guest anions as well as their thermal stability and reorientation behavior are significantly influenced by their charge density. The maximal dimension of the [Eu(EDTA)(H2O)3]− anion is nearly perpendicular to the LDH layers and a reversible reorientation occurs on mild heating. The structural changes that occurred on heating were followed by variable temperature photoluminescence (PL) measurements. The kinetics of the structural transformation of ZnAl-Eu(EDTA) LDH in the temperature range 30−150 °C have also been studied. In the case of [Eu(NTA)2(H2O)]3−, the anion adopts a flat orientation in the interlayer galleries with its maximum dimension nearly parallel to the metal hydroxyl layers and no reorientation is observed on heating.

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