Collect. Czech. Chem. Commun. 2001, 66, 605-620

Synthesis and Crystal Structures of Dimethylsilylene-Bridged (Amidocyclopentadienyl)dichlorotitanium(IV) Complexes with Various Substituents on the Cyclopentadienyl Ligand

Jaroslav Zemáneka, Petr Štěpničkab, Karla Fejfarováb, Róbert Gyepesb, Ivana Císařováb, Michal Horáčeka, Jiří Kubištaa, Vojtech Vargac and Karel Macha,*

a J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejškova 3, 182 23 Prague 8, Czech Republic
b Department of Inorganic Chemistry, Charles University, Hlavova 2030, 128 40 Prague 2, Czech Republic
c Research Institute of Inorganic Chemistry, 400 01 Ústí nad Labem, Czech Republic


(Amidocyclopentadienyl)dichlorotitanium(IV) complexes of the general formula [TiCl251(N)-C5(1-SiMe2Nt-Bu-2,3,4-Me3-5-R)}], where R = H (6b), Ph (6c), 4-fluorophenyl (6d) and 1-methylallyl (6e) were synthesized and characterized by spectral methods. Solid-state structure of [TiCl251(N)-C5Me4(SiMe2Nt-Bu)}] (6a) and 6d determined by single-crystal X-ray diffraction showed that variation of the ring substituent R has only a negligible effect on the molecular structure of the complexes. The NMR spectra indicate that motion of the bulky substituent R in compounds 6c, 6d and 6e is hindered below ca 50 °C.

Keywords: Titanium; Half-sandwich complexes; Cyclopentadienyl ligands; (Amidocyclopentadienyl)dichlorotitanium(IV) complexes; Substituent effects; X-Ray diffraction; NMR spectroscopy; Alkene polymerization catalysts.

References: 35 live references.