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Issue 1, 2011
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Stable heteroleptic complexes of divalent lanthanides with bulky pyrazolylborate ligands – iodides, hydrocarbyls and triethylborohydrides

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Abstract

The reaction of YbI2 with KTpMe2 gives (TpMe2)YbI(THF)2 (1-Yb) as a thermally unstable product. Use of the more hindered KTptBu,Me gave (TptBu,Me)LnI(THF)n (Ln = Sm, n = 2, 2-Sm; Ln = Yb, n = 1, 2-Yb). The crystal structures of both these compounds are reported. Adducts with neutral ligands such as pyridines and isonitriles can be prepared and the crystal structures of [(TptBu,Me)YbILn] (L = CNtBu, n = 1; L = 3,5-lutidine, n = 2) are described. 2-Sm can be oxidized using AgBPh4 to give [(TptBu,Me)SmI(THF)2]BPh4. Compounds 2-Sm and 2-Yb are useful starting materials for the preparation of heteroleptic compounds by metathesis with appropriate potassium reagents. The preparations and characterization of the hydrocarbyls (TptBu,Me)Ln{CH(SiMe3)2} (Ln = Sm, 5-Sm; Yb, 5-Yb) and [(TptBu,Me)Ln{CH2(SiMe3)}(THF)] (Ln = Yb, 6a-Yb) and the triethylborohydrides [(TptBu,Me)Ln(HBEt3)(THF)n] (Ln = Sm, n = 0, 7-Sm; Yb, n = 1, 7-Yb) are reported, as well as the crystal structures of 5-Sm and 5-Yb, and the THF adducts 6a-Yb and [(TptBu,Me)Sm{CH(SiMe3)2}(THF)], 5a-Sm.

Graphical abstract: Stable heteroleptic complexes of divalent lanthanides with bulky pyrazolylborate ligands – iodides, hydrocarbyls and triethylborohydrides

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Publication details

The article was received on 18 Mar 2010, accepted on 01 Oct 2010 and first published on 12 Nov 2010


Article type: Paper
DOI: 10.1039/C0DT00162G
Citation: Dalton Trans., 2011,40, 195-210
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    Stable heteroleptic complexes of divalent lanthanides with bulky pyrazolylborate ligands – iodides, hydrocarbyls and triethylborohydrides

    X. W. Zhang, G. H. Maunder, S. Gießmann, R. MacDonald, M. J. Ferguson, A. H. Bond, R. D. Rogers, A. Sella and J. Takats, Dalton Trans., 2011, 40, 195
    DOI: 10.1039/C0DT00162G

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