Abstract
Stoichiometric reaction of 8-hydroxyquinoline with titanium
tetraethoxide, and zirconium and hafnium tetra-2-propoxide in toluene at
room temperature resulted in formation of
M-2--(OR)(2)-(C9H6NO)(2)(OR)(2) (1: M=Ti, R=Et; 2: M=Zr, R=Pr-i; 3:
M=Hf, R=Pr-i). All complexes were characterised by infrared,
ultraviolet-visible, and NMR spectroscopy, and mass spectrometry. The
molecular structures of 1, 2, and 3 were determined by single-crystal
X-ray diffraction. The coordination geometries around the metal ions are
distorted octahedral, which share an edge through bridged alkoxy groups.
Each anionic 8-quinolinolate ligand is also chelated to one metal ion
through its pyridine nitrogen and phenolate oxygen atoms.
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