Ligand-assisted assembly of polyoxozirconium clusters: syntheses and characterizations of tri- and tetranuclear half-zirconocene complexes.

Two different polyoxozirconium oxide clusters tri- and tetranuclear half-zirconocene complexes assisted by 2,3,4,5-tetrafluorobenzoic acid and 3,4,5,6-tetrafluorophthalic acid have been synthesized and characterized by elemental analysis, FT-IR, NMR (1H, 19F, and 13C) spectroscopy, and X-ray crystallography. The structure analyses reveal that 1 is trinuclear with a µ3-oxygen bridge, central to a Zr-O backbone; 2 is a tetranuclear complex with four Zr's tetrahedrally arranged around a µ4-oxygen. [ABSTRACT FROM AUTHOR]