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Issue 35, 2011
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Nickel complexes of a bis(benzimidazolin-2-ylidene)pyridine pincer ligand with four- and five-coordinate geometries

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Abstract

The four- and five-coordinate complexes [(CNC)NiX2] (X = Cl, Br, I), [(CNC)NiX]PF6 (X = Cl, Br) and [(CNC)NiCl]Cl·H2O have been isolated, where CNC is the bis(N-butylbenzimidazolin-2-ylidene)-2,6-pyridine pincer ligand. A five-coordinate geometry is rare for this class of complex. Where amenable, the complexes have been structurally characterised by single crystal X-ray diffraction studies and in solution by NMR, UV-vis and MS studies. The five-coordinate dibromo complex [(CNC)NiBr2] is readily prepared on the gram-scale from the benzimidazolium salt precursor and Ni(OAc)2·4H2O in DMSO without the exclusion of air. Halide exchange and salt metathesis reactions using [(CNC)NiBr2] afford the other four- and five-coordinate complexes. [(CNC)NiBr2] displays very low solubility, and upon dissolution affords solutions of the four-coordinate [(CNC)NiBr]+. Factors that influence the formation of four- or five-coordinate complexes with this ligand class are discussed.

Graphical abstract: Nickel complexes of a bis(benzimidazolin-2-ylidene)pyridine pincer ligand with four- and five-coordinate geometries

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Publication details

The article was received on 17 May 2011, accepted on 24 Jun 2011 and first published on 03 Aug 2011


Article type: Paper
DOI: 10.1039/C1DT10928F
Citation: Dalton Trans., 2011,40, 8849-8858
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    Nickel complexes of a bis(benzimidazolin-2-ylidene)pyridine pincer ligand with four- and five-coordinate geometries

    D. H. Brown and B. W. Skelton, Dalton Trans., 2011, 40, 8849
    DOI: 10.1039/C1DT10928F

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