Phosphane coordination to rare earth metal centers: monomeric, solvent-free complexes of type Cp′2LnX with phosphanoethyl substituted cyclopentadienyl ligands
摘要:
The reaction of phosphanoethyl substituted cyclopentadienides [C5H4CH2CH2PR2]M, R = Me, Cy, t-Bu, Ph, M = Li, K with LnX(3) (Ln = rare earth metal, X=Cl-, CF3SO3-) afforded twofold substituted metal complexes of the type (C5H4CH2CH2PR2](2)LnX. Using the dianionic ligand Li-2[(C5H4CH2CH2)(2)PMe] phosphano bridged ansa metallocene derivatives [(C5H4CH2CH2)(2)PMe]LnX( (Ln = Y, Lu; X = Cl-, CF3SO3-) were isolated. The complexes are soluble in toluene, monomeric and free of solvent. According to X-ray studies on [C5H4CH2CH2PMe2](2)YCl, a distorted trigonal bipyramid with two axial phosphano groups and two equatorial cyclopentadienyl moieties is the structural motif, the third equatorial site being occupied by the halide ligand. (C) 2000 Elsevier Science S.A. All rights reserved.