Abstract
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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