Ytterbium(II) Complex Bearing a Diaminobis(phenolate) Ligand: Synthesis, Structure, and One-Electron-Transfer and -Caprolactone Po

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• 作者：Hui Zhou ; Huadong Guo ; Yingming Yao ; Liying Zhou ; Hongmei Sun ; Hongting Sheng ; Yong Zhang ; Qi Shen
• 刊名：Inorganic Chemistry
• 出版年：2007
• 出版时间：February 5, 2007
• 年：2007
• 卷：46
• 期：3
• 页码：958 - 964
• 全文大小：126K
• 年卷期：v.46,no.3(February 5, 2007)
• ISSN：1520-510X

文摘

The first divalent ytterbium complex supported by a diaminobis(phenolate) ligand, YbL(THF)₂·0.5C₇H₈ (1; THF =tetrahydrofuran), was synthesized in good yield by the amine elimination reaction of Yb[N(SiMe₃)₂]₂(THF)₂ with H₂L(L = [Me₂NCH₂CH₂N(CH₂-2-OC₆H₂-3,5-Bu^t₂)₂]) in a 1:1 molar ratio. X-ray structural determination shows complex1 to be a THF-solvated monomer, which adopts a distorted octahedral coordination geometry around the Yb atom.Complex 1 can react with PhNCO and PhCCH, as a single electron-transfer reagent, to give the correspondingreduction coupling product [(YbLOCNPh)(THF)]₂·4THF (2) and the alkynide complex YbLCCPh(DME) (3; DME= 1,2-dimethoxyethane). Complexes 2 and 3 have been characterized by X-ray crystal structural analysis. Incomplex 2, the dianionic oxamide ligand resulting from the reductive coupling of two phenyl isocyanate moleculescoordinates to two Yb atoms in a ,⁴ fashion. Complex 3 has a monomeric structure with a Yb-C(terminalphenylacetynide) bond length of 2.374(3) Å. Complex 1 is also a highly efficient catalyst for ring-opening polymerizationof -caprolactone.