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Europium “Second Generation” Precursors for Metal‐Organic Chemical Vapor Deposition: Characterization and Optical Spectroscopy
Author(s) -
Malandrino Graziella,
Bettinelli Marco,
Speghini Adolfo,
Fragalà Ignazio Luciano
Publication year - 2001
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/1099-0682(200104)2001:4<1039::aid-ejic1039>3.0.co;2-2
Subject(s) - diglyme , chemistry , europium , thermogravimetric analysis , infrared spectroscopy , raman spectroscopy , inorganic chemistry , luminescence , coordination sphere , crystallography , metal , ion , organic chemistry , solvent , physics , optoelectronics , optics
The novel complex precursor Eu(hfa) 3 ·monoglyme and the analogous Eu(hfa) 3 ·diglyme [Hhfa = 1,1,1,5,5,5‐hexafluoroacetylacetone, monoglyme = CH 3 OCH 2 CH 2 OCH 3 , diglyme = CH 3 O(CH 2 CH 2 O) 2 CH 3 ] 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 °C from a solid to a plastic phase for Eu(hfa) 3 ·diglyme.