Diastereoisomerism and inter-metallic electronic communication: synthesis and structural analysis of a fully conjugated macrocyclic exo-ditopic ligand bearing two 2,2′-bipyridine units and of its binuclear osmium diastereoisomers

Abstract

The synthesis of a new macrocyclic exo-ditopic ligand bearing two, 2,2′-bipyridine units interconnected at the 4 and 4′ positions by two –CHCH– spacers was achieved, and its Os(II) homobinuclear diastereomeric complexes were prepared, separated and characterised in the solid state by X-ray diffraction on single crystals; the two stereoisomers showed almost identical electrochemical and UV–VIS characteristics and rather weak metal–metal interactions.