Abstract
The synthesis, characterization and reactivity of ytterbium monochloride supported by tridentate Schiff base ligands are described. The metathesis reaction of anhydrous YbCl3 with 1equivalent of the sodium salt of a Schiff base, [{LNa(THF)}2] (1) [LH=3,5-But2-2-(OH)-C6H2CHN-8-C9H6N], gave the ytterbium Schiff base monochloride complex L2YbCl (2). Complex 2 reacted with NaOAr (OAr=OC6H3But-2-Me-4) in a 1:1 molar ratio to form the desired aryloxo derivative L2Yb(OAr) (3). Complex 3 can also be prepared by the one-pot reaction of the Schiff base HL, n-BuLi, YbCl3 and NaOAr in a 2:2:1:1 molar ratio. However, an unprecedented ytterbium aryloxide LL′Yb(OAr) (4) (L′=3,5-But2-2-(O)C6H2CH(C4H9)-NH-8-C9H6N) can be isolated in low yield as a byproduct in the later case. Reaction of complex 2 with 1equivalent of (CH2CH–CH2)MgBr in THF afforded the unexpected complex [Mg(H2N-8-C9H6N)Cl(THF)3]Br (5). Complexes 2–5 were fully characterized by elemental analysis and X-ray diffraction.
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