Synthesis and Crystal Structure of Rare Earth Metal Chlorides Bearing Bridged‐Indenyl Ancillary Ligand

Abstract

Two new rare earth metal chloride complexes supported by a bridged-indenyl ancillary ligand, [C 9 H 6 SiMe 2 -(CH 2 ) 2 SiMe 2 C 9 H 6 ]Ln(µ-Cl) 2 Li(TMEDA) [Ln＝Y (1), Lu (2)], were synthesized via salt metathesis reaction. Reaction of C 9 H 7 SiMe 2 (CH 2 ) 2 SiMe 2 C 9 H 7 with 2 equiv. of n-butyllithium in hexane at room temperature afforded [C 9 H 6 SiMe 2 -(CH 2 ) 2 SiMe 2 C 9 H 6 ]Li 2 as white powder in 95% isolated yield. Further treatment of [C 9 H 6 SiMe 2 (CH 2 ) 2 SiMe 2 -C 9 H 6 ]Li 2 with anhydrous LnCl 3 in 1 ∶ 1 molar ratio in THF/TMEDA at room temperature provided the bridged-indenyl rare earth metal chlorides 1 and 2 in 86%-89% isolated yields. Both complexes were characterized by FT-IR spectroscopy, NMR spectroscopy, elemental analysis, and X-ray single crystal structure analysis. The central metals in both complexes are eight-coordinated by two indenyl ligands in η 5 -fashion, and two chlorine atoms to adopt a distorted tetrahedral geometry.