Issue 1, 2011
From the journal:

Dalton Transactions

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

X. W. Zhang,a   Graham H. Maunder,b   Stefan Gießmann,a   Robert MacDonald,a   Michael J. Ferguson,a   Andrew H. Bond,‡c   Robin D. Rogers,d   Andrea Sella*b  and  Josef Takats*a  

* Corresponding authors

a Department of Chemistry, University of Alberta, Edmonton AB. T6G 2G2, Canada

b Department of Chemistry, Christopher Ingold Laboratories, University College London, 20 Gordon Street, London, United Kingdom

c Department of Chemistry, Northern Illinois University, DeKalb, USA

d Department of Chemistry, The University of Alabama, Tuscaloosa, USA

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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Article information

DOI
https://doi.org/10.1039/C0DT00162G
Article type
Paper
Submitted
18 Mar 2010
Accepted
01 Oct 2010
First published
12 Nov 2010

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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