Iron and cobalt complexes of 5,5′-di(methylene-N-aminoacidyl)-2,2′-bipyridyl ligands: ligand design for diastereoselectivity and anion bindingElectronic supplementary information (ESI) available: 1H NMR spectrum of [Co(1)3]3+ as a function of pH; 2D NOESY 1H NMR spectrum of [Co(1)3Cl2]+; 2D ROESY 1H NMR spectrum of [Co(1)3]3+. See http://www.rsc.org/suppdata/dt/b2/b208934c/