Near infra-red emission from a mer-Ru(ii) complex: consequences of strong σ-donation from a neutral, flexible ligand with dual binding modes

Abstract

A rare example of dual coordination modes by a novel tridentate ligand gives rise to unique fac-and mer-Ru^(II/III) complexes. The mer-Ru^II-complex displays the farthest red-shift of a triplet metal-to-ligand charge transfer (³MLCT) emission with a tridentate ligand for a mononuclear complex. This observation is a consequence of large bite angle and strong σ-donation by the ligand, the combined effect of which helps to separate the energy of the ³MLCT and ³MC states.