Siloxanediolates of the rare earth elements - An eight-membered inorganic ring system containing ytterbium

Abstract

Treatment of anhydrous YbCl3 with LiN(SiMe3) 2 followed by reaction with 1 equivalent of 1,1,3,3,5,5-hexaphenyl-1, 3,5-trisiloxanediol afforded the first mono(trisiloxanediolate) complex of a rare earth element. The compound [Ph2Si(OSiPh2O) 2]-Yb(THF)(μ-Cl)3Li2(THF)3 (1) was isolated in the form of colorless crystals in very high yield (93%). A single-crystal X-ray diffraction study confirmed the presence of an eight-membered inorganic ring system containing ytterbium. Coordination of one THF ligand and retention of two equivalents of lithium chloride lead to formation of an "ate" complex. © 2008 Wiley-VCH Verlag GmbH & Co. KGaA.