Yttrium acetylacetone

Barash, E.H., Coan, PS., Lobkovsky, F.B., Streib, W.E., and Caulton, K.G (1993) Anhydrous yttrium acetylacetonate and the course of thermal dehydration of Y(acac)3 H20. Inorganic Chemistry, 32, 697-501. Gamer, M.T., Lan, Y, Roesky, P.W., Powell, A.K., and Clerac, R. (2008) Pentanuclear dysprosium hydroxy cluster showing single-molecule-magnet behavior. Inorganic Chemistry, 47, 6581-6583. 

From Zirconium Isopropoxide and Yttrium Acetylacetonate by Flame Pyrolysis Properties 9 mol% yttria, BET specific surface area 68 rnVg [2206]. 

The acetylacetonates are stable in air and readily soluble in organic solvents. From this standpoint, they have the advantage over the alkyls and other alkoxides, which, with the exception of the iron alkoxides, are not as easily soluble. They can be readily synthesized in the laboratory. Many are used extensively as catalysts and are readily available. They are also used in CVD in the deposition of metals such as iridium, scandium and rhenium and of compounds, such as the yttrium-barium-copper oxide complexes, used as superconductors. 1 1 PI Commercially available acetyl-acetonates are shown in Table 4.2. 

Also increasingly common, as CVD precursors, are many halogen-acetylacetonate complexes, such as trifluoro-acetylacetonate thorium, Th(C5H4F302)4, used in the deposition of thoriated tungsten for thermionic emitters, the trifluoro-acetylacetonates of hafnium and zirconium and the hexafluoro-acetylacetonates of calcium, copper, magnesium, palladium, strontium, and yttrium. 

MOCVD of Zirconia. Yttria-stabilized zirconia is also deposited by MOCVD.Deposition can be accomplished by the codecomposition of the tetramethyl heptadiones of zirconium and yttrium, Zr(CjjHj902)3 and Y(CjjHj902)3, at 735°C. Deposition is also achieved by the decomposition of the trifluoro-acetylacetonates in a helium atmosphere above 300°C.P 1 Other potential MOCVD precursors are bis(cyclopentadienyl)zirconium dichloride, (C5H5)2ZrCl2, and zirconium (IV) trifluoroacetylacetonate,... 

In the vast majority of cases, such syntheses are carried out by the immediate interaction of liquid DMSO with metal salts in absence of solvents. In this respect we note the adducts of DMSO with yttrium and neodymium /ra-acetylacctonatcs [M(acac)3(DMS0)(H20)], obtained by a lingering contact of solid acetylacetonates of the metals above with DMSO [64-68]. 

The reported structure of Y(acac)3 3H2O, where acac represents acetylacetonate, has two water molecules attached to yttrium and one water molecule which acts as a bridge by hydrogen bonding with water molecules coordinated to two different yttrium ions (3). In the OMPA... 

Apart from the compounds already mentioned, vanadium, manganese, and cobalt chlorides, tetra-alkoxy derivatives of titanium, acetylacetonates of V, Cr, Mo, Mn, and Ni, Cp derivatives of Zr and Nb, and triphenyl phosphine complexes of Ti and Fe were found to be active. Later lanthanide complexes were included in the list of dinitrogen-reducing systems, the most effective being compounds of samarium and yttrium. 

However, it is helpful to have data on the solubility of compounds. For example, solubility measurements on copper, yttrium, and barium acetylacetonates and hex-afluoro acetylacetonates have been carried out in supercritical CO2 at 423 and 447 K at a pressure range between 120 and 220 bar. The thermal behavior of these solutions has been studied, as well as the influence of ethanol as the added solvent... 

Hubert-Pfalzgraf, L. G., Poncelet, O., and Daran, J. C., Tailored molecular precursors of yttrium oxide using functional alcohols and acetylacetone as modifiers. Better Ceramics Through Chemistry IV Mat., Res. Soc. Symp. Proc., 180, 73 (1990). 

When yttrium alkoxide/acetylacetonate has been prepared, Cu(acac)2 has been used as a source of ocac-groups [60] ... 

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