Fig. 1. Sketch of axial chirality in metal complexes: (a) axial chirality with bidental ligands (e.g. 2,2′-bipyridine). (b) Concept of introducing chirality by macrocyclization. Top: achiral complex of a tridentate ligand (e.g. 2,2′:6′,2′′-terpyridine). Bottom: axial chiral metal complexes obtained by interlinking the ends of the two tridentate ligands (interlinking bridges in red).
