CHIRAL LANTHANOCENE COMPLEXES WITH AN ETHER-FUNCTIONALIZED INDENE LIGAND - SYNTHESIS AND STRUCTURE OF BIS(1-(2-METHOXYETHYL)INDENYL)LANTHANOCENE CHLORIDES

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 ligan d were synthesized by the reaction of 1-(2-methoxyethylindenyl) potass ium (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 sol id state. This configuration also predominated in THF solution, as evi denced by NMR spectra of the diamagnetic complexes 1, 2 and 6, althoug h some minor species of 1 and 2 did form upon dissolution. (C) 1998 El sevier Science S.A. All rights reserved.