Chiral lanthanocene complexes with an ether-functionalized indene ligand: synthesis and structure of bis{1-(2-methoxyethyl)indenyl}lanthanocene chlorides

摘要

Chiral lanthanocene chlorides (CH3OCH2CH2C9H6)(2)LnCl (Ln = Y 1, La 2, Nd 3, Gd 4, Ho 5 and Lu 6) with an ether-functionalized indenyl ligand were synthesized by the reaction of 1-(2-methoxyethylindenyl) potassium (in situ) with corresponding anhydrous lanthanide chlorides in THF. The X-ray crystal structures of four such complexes were determined and these indicated that they were unsolvated monomeric complexes with a trans arrangement of both the sidearms and indenyl rings in the solid state. This configuration also predominated in THF solution, as evidenced by NMR spectra of the diamagnetic complexes 1, 2 and 6, although some minor species of 1 and 2 did form upon dissolution. (C) 1998 Elsevier Science S.A. All rights reserved. [References: 39]