Cyclooctatetraenyl complexes of the early transition metals and lanthanides: X. The first organometallic triple decker sandwich complexes of the lanthanides

Abstract

Treatment of anhydrous lanthanide trichlorides with Li 2C 8H 6(SiMe 3) 2-1,4 in a 2:3 molar ratio affords the first well-defined organolanthanide triple decker sandwich complexes. The compounds Ln 2[C 8H 6(SiMe 3) 2-1,4] 3 ( 2– 4; Ln=Ce, Nd, Sm) were characterized by elemental analyses and spectroscopic methods. An alternative preparation of 2 involves a ligand redistribution reaction between CeCl 3 and the anionic sandwich complex [Li(THF) 4][Ce{C 8H 6(SiMe 3) 2-1,4} 2] ( 5).