Abstract A series of ionic diiminoiridium complexes [Ir (piq-C∧ N) 2 (LN∧ N)](PF 6) were prepared, where piq-C∧ N is 1-phenylisoquinolinato and LN∧ N are bidentate N- coordinating ligands: 2, 2′-bipyridine (bpy), 4, 4′-dimethyl-2, 2′-bipyridine (mbpym), 5, 5′-bis (thiopen-2-yl)-2, 2′-bipyridine (tbpyt), and 5, 5′-bis (9, 9-dioctylfluoren-2-yl)-2, 2′- bipyridine (FbpyF). X-ray diffraction studies of [Ir (piq) 2 (mbpym)](PF 6) revealed that the ...