Stereoselectivity in the formation of tris-diimine complexes of Fe(ii), Ru(ii), and Os(ii) with a C2-symmetric chiral derivative of 2,2′-bipyridineElectronic supplementary information (ESI) available: Experimental details for the synthesis of the (−)-Lligand. See DOI: 10.1039b512116g

A C2-symmetric enantiopure 4,5-bis(pinene)-2,2′-bipyridine ligand (−)-Lwas used to investigate the diastereoselectivity in the formation of [ML3]2coordination species (M = Fe(ii), Ru(ii), Os(ii), Zn(ii), Cd(ii), Cu(ii), Ni(ii)), and [ML2Cl2] (M = Ru(ii), Os(ii)). The X-ray structures of the [ML3]2complexes were determined for Δ-[FeL3](PF6)2, Δ-[RuL3](PF6)2, Λ-[RuL3](PF6)2, Δ-[OsL3](PF6)2, and Λ-[OsL3](TfO)2. All of these compounds were also characterized by NMR, CD and UV/VIS absorption spectroscopy. The [FeL3]2diastereoisomers were studied in equilibrated solutions at various temperatures and in several solvents. The [RuL3]2complexes, which are thermally stable up to 200 °C, were photochemically equilibrated.