Issue 1, 2011

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

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

Supplementary files

Article information

Article type
Paper
Submitted
18 Mar 2010
Accepted
01 Oct 2010
First published
12 Nov 2010

Dalton Trans., 2011,40, 195-210

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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