374568-95-3Relevant articles and documents
Thermochemical properties of some f-electron element β-diketonates, and metal-oxygen bond energies. Lanthanum(III) β-diketonates
Giera, E.,Kakolowicz, W.
, p. 977 - 982 (1988)
The interest in the lanthanum(III) β-diketonate complexes as well as in chelates of the other rare earth elements is great, because of their unusual physicochemical properties: laser activity, performance as shift reagents, volatility and solubility in no
Investigation of nanocrystalline phases in Li-La-Fe-O system formed by the decomposition of acetylacetonato complexes
Vu?ini?-Vasi?,Antic,Kremenovi?,Nikolic,Blanusa,Raki?,Spasojevic,Kapor
, p. 322 - 326 (2008/10/09)
Applying a new synthesis route based on the thermal decomposition of a mixture acetylacetonato complexes, Li(AA), La(AA)3 and Fe(AA)3, Li, La ferrite (Li0.5La0.08Fe2.42O4) was formed. The element analysis performed by ICP technique and the Rietveld refinement data indicate that the sample is composed of three phases: Li0.5La0.08Fe2.42O4 (69%, SG P4332, a = 8.3445(3) ?), La0.14Fe3O4 (16%, SG F d over(3, ?) m, a = 8.403(1) ?) and LiFeO2 (15%, SG F m over(3, ?) m, a = 4.2291(8) ?). A partial substitution Fe3+ → La3+ in Li ferrite and La insertion at 16c site in Fe3O4 occur at low concentrations. A partial cation ordering at 4b and 12d octahedral sites in Li0.5La0.08Fe2.42O4 was noticed. TEM micrograph shows that the nanoparticles are spherically shaped and that the particle distribution is in the range between 7 and 33 nm. The sample exhibits superparamagnetic behavior, thus the composite has potential industrial applications.
Synergism by sublimation of volatile lanthanide β-diketonates
Kuzmina, Natalia P.,Martynenko, Larissa I.,Chugarov, Nikolai V.,Zaitseva, Irina G.,Grigoriev, Andrei N.,Yakushevich, Andrei N.
, p. 158 - 162 (2008/10/08)
The synergistic effect by sublimation manifests itself in an increase in the volatility of nonvolatile or slightly volatile compounds in the presence of highly volatile agents. In this study, manifestations of the synergistic effect are demonstrated by th
SYNTHESIS OF YTTRIUM, LANTHANUM, NEODYMIUM, PRASEODYMIUM, AND LUTETIUM ALKOXIDES AND ACETYLACETONATES
Gavrilenko, V. V.,Chekulaeva, L. A.,Savitskaya, I. A.,Garbuzova, I. A.
, p. 1957 - 1959 (2007/10/02)
A convenient and practical method is proposed for the synthesis of lanthanide and yttrium alkoxides.The method involves dissolving the metals or their hydrides in a solution of dry HCl in the corresponding alcohol, with subsequent dehalogenation of the LnCl3 solution by an equivalent amount of alkali metal (Na, Li).The rareearth alkoxides are easily converted into acetylacetonates Ln(acac)3 by the action of acetylacetone. Keywords: lanthanide alkoxides, lanthanide acetylacetonates, synthesis, yttrium, lanthanum, praseodymium, lutetium.
Anhydrous and hydrated rare earth acetylacetonates and their infrared spectra
Richardson, Mary Frances,Wagner, William F.,Sands, Donald E.
, p. 2495 - 2500 (2008/10/08)
Chemical analyses, X-ray powder diffraction patterns, and infrared spectra were used to characterize anhydrous, mono-, di-, and trihydrated rare earth acetylacetonates, and the densities of the hydrated chelates were determined. The anhydrous chelates were obtained by vacuum drying one of the hydrates. They are not appreciably volatile and slowly decompose in vacuo at elevated temperatures. Trihydrates precipitate from 60% aqueous ethanol, dihydrates from cold 95% ethanol, and monohydrates from hot 95% ethanol and a variety of other solvents. The infrared spectra are distinctive for each of the series of hydrates. For a given hydrate series, the spectra obtained are practically independent of the rare earth ion. The most notable exception is the 3100-3600-cm-1 region of the monohydrates where the high-energy O-H stretching frequency shifts to higher wave numbers and the low-energy O-H stretching frequency shifts to lower wave numbers as the ionic size of the rare earth decreases. Deuterium isotopic substitution studies on the mono- and trihydrates were used to locate the C-H and coordinated H2O vibrations.
