Metal-directed assembly of combinatorial libraries—principles and establishment of equilibrated libraries with oligopyridine ligands

Barbara Brisig; Edwin C. Constable; Catherine E. Housecroft

doi:10.1039/B707601K

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New Journal of Chemistry

Issue 8, 2007

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Metal-directed assembly of combinatorial libraries—principles and establishment of equilibrated libraries with oligopyridine ligands

Barbara Brisig , Edwin C. Constable and Catherine E. Housecroft

New J. Chem., 2007, 31, 1437-1447

DOI: 10.1039/B707601K
Received 21 May 2007, Accepted 30 May 2007
First published on the web 19 Jun 2007

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Abstract
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The cobalt(II) complexes [Co(bpy)₃][PF₆]₂, [Co(Me₂bpy)₃][PF₆]₂ (Me₂bpy = 4,4′-dimethyl-2,2′-bipyridine) and [Co(phen)₃][PF₆]₂ give paramagnetically shifted ¹H NMR spectra which may be fully assigned; the complexes are labile and ligand exchange is complete within mixing time in CD₃CN solutions to give libraries of heteroleptic complexes which have been fully characterised by one- and two-dimensional ¹H NMR spectroscopy. A library comprising mer and fac isomers of [CoL₃]²⁺ (L = 2,2′-bipyridine-5-carbaldehyde) can be amplified by specific reaction of the fac stereoisomer with a triamine to give a new hexadentate ligand, although other ligand exchange processes compete.

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Metal-directed assembly of combinatorial libraries—principles and establishment of equilibrated libraries with oligopyridine ligands

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