Issue 13, 2009

Heteroleptic ytterbium(ii) complexes supported by a bulky β-diketiminato ligand

Abstract

Heteroleptic β-diketiminatoytterbium(II) complexes [{Yb(L)(μ-I)(thf)}2] [1: L = {N(Ar*)C(Me)}2CH = L1, 2: L = {N(SiMe3)C(Ph)}2CH = L2; Ar* = C6H3iPr2-2,6] were prepared by a salt elimination [from YbI2(thf)2 and KL] or by a ligand redistribution [from YbI2(thf)2 and YbL2] reaction. Complexes 1 and 2 were convenient precursors to some new Yb(II) heteroleptic compounds. Thus, reaction of 1 and 2 with KN(SiMe3)2 yielded the mononuclear amido compounds [Yb(L){N(SiMe3)2}(thf)] (3: L = L1 and 4: L = L2). Similarly, 1 with K{N(H)Ar*} gave [Yb(L1){N(H)Ar*}(thf)] (5). Complex 3 was also obtained via a protolytic reaction of [Yb{N(SiMe3)2}2(thf)2] with HL1 at an elevated temperature. Treatment of 1 with slightly less than a stoichiometric amount of K{CH(SiMe3)2} afforded [Yb(L1){CH(SiMe3)2}(thf)] (6), while using even a small excess of the alkyl reagent resulted in the deprotonation of the β-diketiminato ligand and the formation of the known dimer [{Yb(L3)(thf)}2] [7, L3 = [N with combining macron](Ar*)C(Me)C(H)C([C with combining macron]H2)N(Ar*)]. Compounds 1 or 2 reacted with KCPh3 in thf yielding [Yb(L1){η5-C6H5CPh2}(thf)] (8) or [Yb(CPh3)2(thf)2] (9), respectively; the latter has two differently coordinated CPh3 ligands. The molecular structures of 1, 2, 4, 5, 6, 8 and 9 were determined by X-ray diffraction.

Graphical abstract: Heteroleptic ytterbium(ii) complexes supported by a bulky β-diketiminato ligand

Supplementary files

Article information

Article type
Paper
Submitted
27 okt 2008
Accepted
18 dek 2008
First published
10 fev 2009

Dalton Trans., 2009, 2383-2391

Heteroleptic ytterbium(II) complexes supported by a bulky β-diketiminato ligand

P. B. Hitchcock, A. V. Khvostov, M. F. Lappert and A. V. Protchenko, Dalton Trans., 2009, 2383 DOI: 10.1039/B818969B

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