Polyfluorocarboxylates. I. Copper(II) trifluoroacetate and its analogues

Synthesis, Characterization and Molecular Structures of Yttrium Trifluoroacetate Complexes with O‐ and N‐Donors: Complexation vs. Hydrolysis

“…If the preceding reaction was carried out in the presence of methyl orthoformate (stoichiometry 1:3), a different product was formed. The presence of methanol in the coordination sphere was confirmed by the reaction with [Y(TFA) 3 Adducts with similar formulae were obtained with other primary amines, namely the tridentate NH 2 C 2 H 4 NHC 2 H 4 X (X = NH 2 , OH) ligands, although these compounds were devoid of water. The various yttrium oxohydroxide trifluoroacetate complexes were often contaminated by some trifluoroacetate ammonium salts which were difficult to separate by crystallization or by sublimation.…”

“…The classical, cost-efficient synthesis of yttrium trifluoroacetate by reacting the oxide with trifluoroacetic acid in refluxing toluene [11] proceeds with formation of water as by-product to afford the hydrate [Y(TFA) 3 -4 Torr) were unsuccessful, probably due to the strong hydrogen bonding between the water molecules and the fluorinated ligand. [12] More efficient dehydration of 1 could be achieved at 200°C in a furnace but some decomposition was observed and the anhydrous Y(TFA) 3 is very hygroscopic due to its high Lewis acidity.…”

“…[3] Trifluoroacetate (TFA) derivatives are currently used for elaboration of high Tc superconductor coatings by MOD (Metal Organic Deposition),…”

“…Lanthanide and yttrium trifluoroacetates associated with Al or Zn alkyls have also attracted interest as catalysts in various polymerization processes. [5] Although a large number of lanthanide trifluoroacetate complexes have been reported, often for their luminescence properties, few of derivatives such as [H 3 O][Y 3 (µ 3 -OH)(µ-O) 3 (η 1 -TFA) 3 (H 2 O) 6 -(en) 3 ] (6; en = NH 2 C 2 H 4 NH 2 ). All complexes were characterized by elemental analysis, FT-IR, and by single-crystal Xray diffraction for 3, 4, and 6.…”

“…Most of them are mixed-ligand species such as [Ln(TFA) 3 L 2 (H 2 O)] [L = pyzNO (pyrazine N-oxide) [6] or aza (2-azacyclononane) [7] ] but species such as [Ln(TFA) 3 (DMF) 2 ] (LL = bipy, o-phen) [8] are also known. Structural characterization remains scarce, although such adducts display a large structural diversity, as represented by the [Ln(TFA) 3 (TMSO) 2 ] (TMSO = tetramethylene sulfoxide) derivatives, [9] which form infinite chains of dimers for Ln = La but discrete dimers for Ln = Nd, as well as [Sm 2 (µ,η 2 -TFA) 4 (η 1 -TFA) 2 (aza) 2 (H 2 O) 2 ]·2aza, [7] ionic compounds for the Ln(TFA) 3 …”