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Redox Transmetallation Approaches to the Synthesis of Extremely Bulky Amido-Lanthanoid(ii) and -Calcium(ii) Complexes

Redox Transmetallation Approaches to the Synthesis of Extremely Bulky Amido-Lanthanoid(ii) and -Calcium(ii) Complexes

Caspar N de Bruin-Dickason, Aaron J Boutland, Deepak Dange, Glen B Deacon, Cameron Jones

Dalton Trans. 2018 Jul 17;47(28):9512-9520.

PMID: 29964281

Abstract:

Redox transmetallation protolysis reactions between HgPh2, elemental metals, M = Ca, Eu, or Yb, and the bulkyl arylsilylamine PhL†H (HN(SiPh3)(Ar†), Ar† = C6H2Pri{C(H)Ph2}2-4,2,6), or the borylsilylamine PhLBoH (HN(SiPh3){B(DipNCH)2}, Dip = C6H3Pri2-2,6) pro-ligands yielded complexes incorporating doubly deprotonated, N,C-chelating amido/organyl ligands, viz. [M(L-H) (thf)x]n, L-H = PhL†-H (1-3) or PhLBo-H (4-5); M = Ca (1, 4), Eu (2) or Yb (3, 5); x = 0 (5) or 2 (1-4); n = 1 (1-4) or 2 (5). Structural differences between 4 and 5 represent a rare divergence in the chemistry of divalent calcium and ytterbium. Utilisation of a less hindered bis(aryl) amine, DLMH (HN(Dip)(Mes), Mes = C6H2Me3-2,4,6) in a similar reaction yielded a three-coordinate, trigonal planar ytterbium complex [Yb(DLM)2(thf)] (6). Direct redox transmetallation reactions between an amido-mercurial iodide [(MeL†)HgI] (7, MeL† = -N(SiMe3)(Ar†)) and ytterbium or europium metal afforded homoleptic [Yb(MeL†)2] (8) and heteroleptic [{Eu(MeL†)(μ-I)(thf)}2] (9) respectively. This study highlights the versatility of redox transmetallation pathways to amido-lanthanoid complexes, especially where such compounds are difficult to access using conventional salt metathesis pathways.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP19357869	Ytterbium(II) iodide		19357-86-9	Price
AP22015356	Europium(II) iodide		22015-35-6	Price

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