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Issue 20, 2013
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Synthesis and catalytic activity of iron complexes with bidentate NHC ligands

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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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Publication details

The article was received on 24 Oct 2012, accepted on 06 Feb 2013 and first published on 07 Feb 2013


Article type: Paper
DOI: 10.1039/C3DT32551B
Citation: 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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