Synthesis and characterization of volatile, thermally stable bis(1,1,1,5,5,5-hexafluoropentane-2,4-dionato)barium-, -strontium- and -calcium · polyether complexes, suitable as precursors in chemical vapour deposition
article
Complexes of the type M(hfac)2·polyether, bis(1,1,1,5,5,5-hexafluoropentane-2,4-dionato)M·polyether (MBa, St, polyether = tetraglyme; MBa, polyether = hexaglyme; MCa, polyether = triglyme), are obtained in high yield upon reaction of M(hfac)2 with one equivalent of polyether. The complexes thus obtained appear to be sublimable, non-hygroscopic, thermally stable solids. They have been characterized by elemental analysis, molecular weight determinations, NMR spectroscopy, mass spectrometry, IR and TG-DTA analysis. The complex Ba(hfac)2·tetraglyme has been characterized by an X-ray structure determination. The barium atom is found to be coordinated by all nine oxygen atoms, with the polyether ligand wrapped around barium in a plane, with one hfac ligand on top of this plane and another below. The absence of short intermolecular interactions explains why the compound sublimes easily without decomposition. © 1991.
TNO Identifier
231630
ISSN
00201693
Source
Inorganica Chimica Acta, 190(1), pp. 109-117.
Pages
109-117
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