J. Fisher, William G. Van DerSluys, J. Huffman
Mar 1, 1993
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Synthesis and Reactivity in Inorganic and Metal-organic Chemistry
Abstract
Abstract Reaction of 2 equiv. of hexafluoro-2-propanol in hexane with tetrakis-isopropoxy titanium (IV) results in the formation of Ti(O-i-Pr)2[OCH(CF3)2]2, a volatile complex which has been characterized by a number of techniques, including X-ray crystallography [space group P21/n; a = 9.786(3) A, b = 18.393(6) A, c = 10.755 A, β = 103.64(1)°; Z = 2]. The molecule adopts a dinuclcar structure in which oxygen atoms of isopropoxidc ligands are asymmetrically bridging [1.900(2) and 2.120(2) A] between the titanium atoms. The coordination geometry about the titanium atoms is roughly that of a trigonal bipyramid with the short interactions of the bridging alkoxtdes occupying equatorial positions and the longer interactions occupying axial positions. The Ti-O distance [1.752(2) A] of the terminal isopropoxy ligand is significantly shorter than the Ti-O distances [1.84(1) A (avg)] of the terminal fluoroalkoxide ligands. NMR data and mass spectral data suggest that this complex is monomene both in solution and i...