Linked Cyclopentadienyl−Amide Complexes of Divalent, Trivalent, and Tetravalent Vanadium: A Vanadium “Constrained Geometry Catalyst”
摘要:
Paramagnetic complexes of V(II), V(III), and V(IV) with a linked cyclopentadienyl-amide ancillary ligand were prepared and structurally characterized. The V(IV) dichloride 4, when activated by MAO cocatalyst, polymerizes ethene with a Lower productivity than that of its Ti(IV) congener 5 and gives polyethene with a considerably lower molecular weight.