Four-and five-co-ordinate lanthanide (<scp>II</scp>) aryloxides: X-ray structures of the bis(2,6-di-t-butyl-4-methylphenoxo)ytterbium(<scp>II</scp>) complexes [Yb(OAr)<sub>2</sub>(L)<sub>2</sub>] and [Yb(OAr)<sub>2</sub>(L′)<sub>3</sub>][ArC<sub>6</sub>H<sub>2</sub>Bu<sup>t</sup><sub>2</sub>-2,6-Me-4, L = tetrahydrofuran (thf) or OEt<sub>2</sub>, L′= thf] - Concepedia

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Four-and five-co-ordinate lanthanide (<scp>II</scp>) aryloxides: X-ray structures of the bis(2,6-di-t-butyl-4-methylphenoxo)ytterbium(<scp>II</scp>) complexes [Yb(OAr)<sub>2</sub>(L)<sub>2</sub>] and [Yb(OAr)<sub>2</sub>(L′)<sub>3</sub>][ArC<sub>6</sub>H<sub>2</sub>Bu<sup>t</sup><sub>2</sub>-2,6-Me-4, L = tetrahydrofuran (thf) or OEt<sub>2</sub>, L′= thf]

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References

1989

Year

Glen B. Deacon, Peter B. Hitchcock, Stephen A. Holmes, Michael F. Läppert, Peter MacKinnon, R.H. Newnham

Journal of the Chemical Society Chemical Communications

Abstract

General methods for the preparation of hydrocarbon-soluble, monomeric ytterbium (II) aryloxides are described {Yb+2TIOAr, or [Yb(NR2)2(OEt2)2]+2ArOH;RSiMe3, ArC6H2But2-2,6-Me-4; crystalline [Yb(OAr)2(thf)3](thf = tetrahydrofuran)(1) has the unprecedented square-pyramidal YbII stereochemistry (one thf apical), whereas the complexes [Yb(Oar)2(L)2][L = thf (2) or OEt2(3)] are tetrahedral, with <Yb–OAr> 2.207 (12)(1), 2.137(10)(2), or 2.154(28)Å(3); complex (3) with thf readily yields (1) or (2)}.