Issue 20, 2013
From the journal:

Dalton Transactions

Synthesis and catalytic activity of iron complexes with bidentate NHC ligands†

Jianguo Wu,a   Wei Dai,a   Joy H. Farnaby,a   Nilay Hazari,*a   Jennifer J. Le Roy,b   Valeriu Mereacre,c   Muralee Murugesu,b   Annie K. Powellc  and  Michael K. Takasea  

* Corresponding authors

a The Department of Chemistry, Yale University, P. O. Box 208107, New Haven, Connecticut, USA

b The Department of Chemistry, University of Ottawa, 10 Marie Curie, Ottawa, ON, Canada

c Institute for Inorganic Chemistry, Karlsruhe Institute of Technology, Engesserstr. 15, D-76131 Karlsruhe, Germany
E-mail: nilay.hazari@yale.edu

Abstract

A family of well-defined FeII complexes of the type {BnN(N-CH2(CH2)n-N′-tert-butyl-imidazole-2-ylidene)2}FeCl2 (Bn = benzyl; n = 1 (1) or 2 (2)), {BnN(N-CH2(CH2)n-N′-methylbenzimidazole-2-ylidene)2}FeCl2 (n = 1 (3) or 2 (4)) and {BnN(N-CH2CH2CH2-N′-methylbenzimidazole-2-ylidene)2}FeBr2 (5) has been synthesized. These complexes are rare examples of Fe species supported by bidentate NHC ligands. Complexes 2, 3, 4 and 5 were characterized by X-ray crystallography and in all cases a distorted tetrahedral geometry is observed around the Fe center. The magnetic data is consistent with the complexes containing non interacting high spin FeII centers (S = 2) and indicates that a large zero-field splitting (D) is present. The new complexes are highly active pre-catalysts for the homo-coupling of Grignard reagents.

Graphical abstract: Synthesis and catalytic activity of iron complexes with bidentate NHC ligands

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Article information

DOI
https://doi.org/10.1039/C3DT32551B
Article type
Paper
Submitted
24 Oct 2012
Accepted
06 Feb 2013
First published
07 Feb 2013

Dalton Trans., 2013,42, 7404-7413

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Synthesis and catalytic activity of iron complexes with bidentate NHC ligands

J. Wu, W. Dai, J. H. Farnaby, N. Hazari, J. J. Le Roy, V. Mereacre, M. Murugesu, A. K. Powell and M. K. Takase, Dalton Trans., 2013, 42, 7404 DOI: 10.1039/C3DT32551B

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