Synthesis and structures of o-phenylene-bridged Cp/phosphinoamide titanium complexes
作者:Chun Ji Wu、Sang Hoon Lee、Hoseop Yun、Bun Yeoul Lee
DOI:10.1016/j.jorganchem.2006.09.010
日期:2006.12
Addition of (R2PCI)-P-' to anilines substituted with di- or trimethylcyclopentadienyl unit at ortho-position affords ortho-phenylenebridged Me2Cp or Me3Cp/phosophinoamide ligands, 2-(RMe2C5H2)C6H4NHPR'(2) (R=Me or H; R'=Ph, iPr, or Cyclohexyl). Successive addition of Ti(NMe2)(4) and Me2SiCl2 to the ligands affords the desired dichlorotitanium complexes, [2-(eta(5)-RMe2C5H)C6H4NPR'(2)-kappa N-2,P]TiC1(2) (R=H, R'=Ph, 9; R=Me, R'=Ph, 10; R=H, R'=iPr, 11; R=Me, R'=iPr, 12; R=H, R'=Cy, 13; R=Me, R'=Cy, 14). By using Zr(NMe2)(4) instead of Ti(NMe2)(4), a zirconium complex, [2-(eta(5)-Me3C5H)C6H4NP(iPr)(2)-kappa N-2,P]ZrC1(2) (15) is prepared. Molecular structures of 10, 14 and [2-(eta(5)-Me2C5H2)C6H4NPPh2-kappa N]Ti(NMe2)(2) (16) were determined. The metric parameters determined on the X-ray crystallographic studies and the chemical shifts of the P-31 NMR signal indicate that the phosphorous atom coordinates to the titanium in the dichloro-complexes 9-15. The titanium and zirconium complexes show negligible activity in ethylene and ethylene/l-hexene (co)polymerization when activated with MAO or iBu(3)Al/[Ph3C][B(C6F5)(4)]. (c) 2006 Elsevier B.V. All rights reserved.