Synthesis and Structural Characterization of Novel Ytterbium(III) Complexes with both a μ‐Oxo Group and Bridged Indenyl Ligands, and Ytterbium(II) Complexes with Bridged Indenyl Ligands

Abstract

Abstract The reactivity of the ytterbium(III) amide [(Me 3 Si) 2 N] 3 Yb(μ‐Cl)Li(thf) 3 with different bridged indene compounds in the presence of external donor ligands was studied. Reaction of [(Me 3 Si) 2 N] 3 Yb(μ‐Cl)Li(thf) 3 with the corresponding 1,2‐bis(indenyl)ethane [(CH 2 ) 2 (C 9 H 7 ) 2 ] or Me 2 Si(C 9 H 7 ) 2 , followed by the addition of excess thf, produced a novel tetranuclear ytterbium complex [{η 5 :η 5 ‐(CH 2 ) 2 (C 9 H 6 ) 2 }Yb(μ‐Cl)(μ 3 ‐O)Yb(Cl)N(SiMe 3 ) 2 Li(thf) 4 ] 2 ( 1 ) or a novel dinuclear ytterbium complex [η 5 :η 5 ‐(CH 3 ) 2 Si(C 9 H 6 ) 2 Yb] 2 (μ‐Cl)(μ‐O)Li(thf) 2 ( 2 ), respectively. Treatment of [(Me 3 Si) 2 N] 3 Yb(μ‐Cl)Li(thf) 3 with (CH 2 ) 2 (C 9 H 6 SiMe 3 ) 2 ( 3 ) or Me 2 Si(C 9 H 7 ) 2 under different conditions produced ytterbium(II) complexes [η 5 :η 5 ‐(CH 2 ) 2 (C 9 H 5 SiMe 3 ) 2 ]Yb(thf) 2 · (C 6 H 14 ) 0.5 ( 4 ) and [η 5 :η 5 ‐(CH 2 ) 2 (C 9 H 5 SiMe 3 ) 2 ]Yb · dme ( 5 ) or [η 5 :η 5 ‐(CH 3 ) 2 Si(C 9 H 6 ) 2 ]Yb · tmeda ( 6 ), respectively. Interaction of the ytterbium(III) amide [η 5 :η 5 ‐(CH 2 ) 2 (C 9 H 6 ) 2 ]YbN(SiMe 3 ) 2 with excess tmeda afforded the ytterbium(II) complex [η 5 :η 5 ‐(CH 2 ) 2 (C 9 H 6 ) 2 ]Yb · tmeda ( 7 ). All the compounds were fully characterized by spectroscopic methods and elemental analyses. Complexes 1 , 2 , and 4 were additionally characterized by single‐crystal X‐ray diffraction analyses. The solvents and temperature effects on the reaction are discussed. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)