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

AbstractThe reactivity of the ytterbium(III) amide [(Me3Si)2N]3Yb(μ‐Cl)Li(thf)3 with different bridged indene compounds in the presence of external donor ligands was studied. Reaction of [(Me3Si)2N]3Yb(μ‐Cl)Li(thf)3 with the corresponding 1,2‐bis(indenyl)ethane [(CH2)2(C9H7)2] or Me2Si(C9H7)2, followed by the addition of excess thf, produced a novel tetranuclear ytterbium complex [{η5:η5‐(CH2)2(C9H6)2}Yb(μ‐Cl)(μ3‐O)Yb(Cl)N(SiMe3)2Li(thf)4]2 (1) or a novel dinuclear ytterbium complex [η5:η5‐(CH3)2Si(C9H6)2Yb]2(μ‐Cl)(μ‐O)Li(thf)2 (2), respectively. Treatment of [(Me3Si)2N]3Yb(μ‐Cl)Li(thf)3 with (CH2)2(C9H6SiMe3)2 (3) or Me2Si(C9H7)2 under different conditions produced ytterbium(II) complexes [η5:η5‐(CH2)2(C9H5SiMe3)2]Yb(thf)2·(C6H14)0.5 (4) and [η5:η5‐(CH2)2(C9H5SiMe3)2]Yb·dme (5) or [η5:η5‐(CH3)2Si(C9H6)2]Yb·tmeda (6), respectively. Interaction of the ytterbium(III) amide [η5:η5‐(CH2)2(C9H6)2]YbN(SiMe3)2 with excess tmeda afforded the ytterbium(II) complex [η5:η5‐(CH2)2(C9H6)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)