Syntheses of low coordination number divalent lanthanoid organoamide complexes, and the x-ray crystal structures of Bis[(N-2,6-diisopropylphenyl)(N-trimethylsiIyl)amido]bis(tetrahydrofuran) samarium(II) and -ytterbium(II)

Glen B. Deacon, Gary D. Fallen, Craig M. Forsyth, Herbert Schumann, Roman Weimann

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Abstract

The mercury(II) amide complex Hg[N(SiMe3)(2,6-iPr2C6H3)] 2 (1) was prepared by reaction of HgBr2 with Li[N(SiMe3)(2,6-iPr2C6H3)] in diethyl ether solvent. Redox transmetallation reactions of 1 with elemental samarium, europium or ytterbium in THF solvent (THF = tetrahydrofuran), generated the novel divalent complexes Ln[N(SiMe3)(2,6-iPr2C6H3)] 2(THF)2 with Ln = Sm (2), Eu (3) and Yb (4). 4 was also synthesized by reaction of elemental ytterbium, HgPh2 and HN(SiMe3)(2,6-]Pr2C6H3) in THF solvent. This generally more convenient approach has also been applied to the preparation of Ln[N(Si-Me3)2]2(THF)2 [Ln = Sm (5), Yb (6)] by reaction of the metals with HgPh2 and HN(SiMe3)2. Thermal desolvation of 4 under high vacuum gave Yb[N(SiMe3)(2,6-jPr2C6H3)]2(THF) (7), whereas under identical conditions 6 yielded the solvent-free complex (Yb[N(SiMe3)2]2}2 (8). The new compounds 1-4 and 7 are hydrocarbon soluble and 171Yb-NMR spectra were recorded for 4, 6, 7 and 8. X-ray crystal structure determinations of 2 and 4 revealed four-coordinate, distorted tetrahedral metal environments augmented by weak Ln⋯ipso-C(aryl) interactions.

Original languageEnglish
Pages (from-to)409-415
Number of pages7
JournalChemische Berichte
Volume130
Issue number3
DOIs
Publication statusPublished - 1 Jan 1997

Keywords

  • (n-2,6-diisopropylphenyl)(n-trimethylsilyl)amide complexes
  • Bis(trimethylsilyl)amide complexes
  • Lanthanides
  • Lanthanoid(ii) complexes
  • Mercury

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