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New J. Chem., 2007, 31, 1437 - 1447, DOI: 10.1039/b707601k
Metal-directed assembly of combinatorial libraries—principles and establishment of equilibrated libraries with oligopyridine ligands
Barbara Brisig, Edwin C. Constable and Catherine E. Housecroft
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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