SYNTHESIS AND STRUCTURAL CHARACTERIZATION OF AN ORGANOTITANIUM COMPLEX CONTAINING A PLANAR BIS(MU-OXO)DITITANIUM CORE

Hydrolysis of trichloro[tris(trimethylsilyl)cyclopentadienyl]titanium, [(eta-5-C5H2(SiMe3)3-1,2,4,]TiCl3 (1), yields with 1/2 equiv of water the mu-oxo complex [(eta-5-C5H2(SiMe3)3-1,2,4]2Ti2Cl4(mu-O) (2), which upon further reaction with water gives dinuclear [(eta-5-C5H2(SiMe3)3-1,2,4]2Ti2Cl2(mu-O)2 (5). An X-ray structural determination of 5 revealed the presence of a planar Ti2(mu-O)2 core with Ti-O distances of 1.814 (1) and 1.835 (1) angstrom and angles at Ti and at O of 84.23 (3) and 95.78 (3) degrees, respectively. The substituted cyclopentadienyl ligands are eta-5-bonded and mutually trans configurated. Compound 5 crystallizes from pentane in the monoclinic space group C2/c, with cell dimensions a = 21.144 (1) angstrom, b = 9.713 (1) angstrom, c = 20.686 (2) angstrom, beta = 93.90 (1) degrees, V = 4238 angstrom3, and D(calcd) = 1.194 g.cm-3 (Z = 4).