Synthesis and crystal structures of dimethylsilylene-bridged (amidocyclopentadienyl)dichlorotitanium(IV) complexes with various substituents on the cyclopentadienyl ligand

(Amidocyclopentadienyl)dichlorotitanium(IV) complexes of the general formul a [TiCl2{eta (5):eta (1)(N)-C-5(1-SiMe(2)Nt-Bu-2,3,4-Me-3-5-R)}] where R = H (6b), Ph (6c), 4-fluorophenyl (6d) and 1-methylallyl (6e) were synthesize d and characterized by spectral methods. Solid-state structure of [TiCl2{et a (5):eta (1)(N)-C5Me4(SiMe(2)Nt-Bu)}] (6a) and 6d determined by single-cry stal X-ray diffraction showed that variation of the ring substituent R has only a negligible effect on the molecular structure of the complexes. The N MR spectra indicate that motion of the bulky substituent R in compounds 6c, 6d and 6e is hindered below ca 50 degreesC.