The novel complex precursor Eu(hfa)(3).monoglyme and the analogous Eu(hfa)(3).diglyme [Hhfa = 1,1,1,5,5,5-hexafluoroacetylacetone, monoglyme = CH3OCH2CH2OCH3, diglyme = CH3O(CH2CH3O)(2)CH3] have been synthesized in a single step reaction and characterized by elemental analysis, mass spectrometry, and IR and Raman spectroscopy. Thermogravimetric data and the Linear evaporation behavior have shown that both complexes are thermally stable and can be evaporated to leave less than 4% residue. Luminescence spectra in the visible region provided evidence of a remarkable covalent character of the metal-ligand bonding in both complexes with the distortion of the coordination sphere around the europium(III) ion in Eu(hfa)(3).monoglyme greater than that in Eu(hfa)(3).diglyme. DSC measurements and variable temperature luminescence spectra have shown the presence of a structural transition at 71.4 degreesC from a solid to a plastic phase for Eu(hfa)(3).diglyme.
|Titolo:||Europium "second generation" precursors for metal-organic chemical vapor deposition: Characterization and optical spectroscopy|
|Autori interni:||MALANDRINO, Graziella|
|Data di pubblicazione:||2001|
|Rivista:||EUROPEAN JOURNAL OF INORGANIC CHEMISTRY|
|Appare nelle tipologie:||1.1 Articolo in rivista|