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Issue 35, 2009
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Controlling the coordination modes of a new and highly flexible ligand bearing two N-heterocyclic carbene moieties at a bipyridine backbone

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Abstract

A new and highly flexible biscarbene ligand with two imidazolin-2-ylidene moieties in 6,6′-position of a 2,2′-bipyridine was prepared and structurally characterised by X-ray analysis. Various silver complexes were prepared from the imidazolium salts. Depending on the counterion, the coordination mode of the ligand can be mono- or bidentate. Pd complexes are feasible directly from the imidazolium salt using palladium(II)-acetate or via transmetallation from silver carbene complexes with [PdCl2(CH3CN)2] or [PdCl2(COD)]. Controlled by the structure of the silver complexes the biscarbenebipyridine ligand is a di- or tetracoordinating ligand forming mono- or dinuclear complexes. The high flexibility of this ligand is confirmed by transmetallation from silver to copper, which results in formation of a dinuclear copper complex with two bridging biscarbene ligands.

Graphical abstract: Controlling the coordination modes of a new and highly flexible ligand bearing two N-heterocyclic carbene moieties at a bipyridine backbone

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Publication details

The article was received on 07 Apr 2009, accepted on 17 Jun 2009 and first published on 22 Jul 2009


Article type: Paper
DOI: 10.1039/B907041A
Citation: Dalton Trans., 2009,0, 7152-7167
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    Controlling the coordination modes of a new and highly flexible ligand bearing two N-heterocyclic carbene moieties at a bipyridine backbone

    C. Deißler, F. Rominger and D. Kunz, Dalton Trans., 2009, 0, 7152
    DOI: 10.1039/B907041A

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