Syntheses, spectral and structural characterization of η5- and η6-cyclic π-perimeter hydrocarbon platinum group metal complexes containing pyridazine-NHC analogues

► First time reporting arene ruthenium containing carbene complexes. ► Pyridazine linked carbenes have been selected for present work due to diversity of bonding modes. ► Novel mononuclear complexes of Ru, Rh and Ir containing pyridazine-NHC ligands were synthesized. ► NHC ligand binds only one metal similar to 3,6-bis(pyrazolyl)pyridazine or 3,6-bis(pyridyl)pyridazine ligands.