Metallaoxirane-Supported Hydrido Group 4 Metallocene Cations
摘要:
The (eta(2)-diaryl ketone)zirconocene dimers 17a and 17b (aryl = phenyl or p-tolyl) react with the group 4 metallocene dihydride complexes [(Cp2MH2)-Cp-R] ((Cp2M)-Cp-R = Cp2Zr, (MeCp)(2)Zr, or Cp2Hf) to yield the dimetallic compounds [mu-eta(1)-O:eta(2)-C,O-Ar2CO)ZrCp2/(H2MCp2)-Cp-R] 18a-f. These systems contain a dimetallabicyclic framework in which the two metal centers are bridged by the eta(2)-diaryl ketone ligand oxygen atom and a mu-hydride ligand. The remaining hydride ligand is trans-oriented to the mu-H moiety at the (MCp2)-Cp-R unit. The complexes 18a-c were characterized by X-ray diffraction. Treatment of the complexes 18 with B(C6F5)(3) results in the selective abstraction of the terminal hydride ligand to form the dimetallic cation complexes [(mu-eta(1)-O:eta(2)-C,O-Ar2CO)ZrCp2(mu-H)(MCp2)-Cp-R](+) 19a-f (with HB(C6F5)(3)- anion). The complexes 19 contain the intact (eta(2)-diaryl ketone)ZrCp2 unit to which a (H-(MCp2)-Cp-R)(+) cation is formally attached. They exhibit a planar dimetallabicyclic framework, in which the two group 4 metal centers are connected by means of the eta(2)-ketone oxygen atom and the mu-hydride ligand, The complexes 19a,b and e were characterized by X-ray crystal structure analyses. The complexes 19 behave chemically as adducts of the highly reactive ((Cp2M)-Cp-R-H)(+) cations with a metallaoxirane matrix. Ethene is polymerized by the systems 19 with high catalyst activities.
New synthetic route for organic polyoxometallic clusters: synthetic and structural investigations on the first dumb-bell shaped polyoxozirconium hydroxide with the [Zr9(µ5-O)2(µ3-O)4(µ-O)4(µ-OH)8] core structureDedicated to Professor C. N. R. Rao on the occasion of his 70th birthday.
作者:Guangcai Bai、Qingjun Ma、Herbert W. Roesky、Denis Vidovic、Regine Herbst-Irmer
DOI:10.1039/b212281b
日期:2003.3.24
A new route for organic polyoxometallic clusters describes the first dumb-bell-like organic polyoxozirconium hydroxide [[(Cp*Zr)4(mu5-O)(mu3-O)2(mu-OH)4]2Zr(mu-O)4] x 2C7H8 (2; Cp* = C5Me5) involving the treatment of the Brønsted acidic organozirconium hydroxide [(Cp*Zr)6(mu4-O)(mu-O)4(mu-OH)8] x 2C7H8 (1) with organozirconium compounds.