Synthesis, photophysical, and electrochemical properties of three novel Ru(II) polypyridyl complexes containing dibenzo-18-crown-6

Three polypyridyl bridging ligands cis-di(4,5-diazafluoren-9-ylimino)dibenzo-18-crown-6 (BL1), trans-di(4,5-diazafluoren-9-ylimino)dibenzo-18-crown-6 (BL2), and 1,4,7,10,13,16-hexaoxacycloctadecyl[2,3:11,12]bis-dipyrido[3,2-a:2′3′-c]phenazine (BL3), and corresponding dinuclear Ru(II) complexes [(bpy)2RuBL1−3Ru(bpy)2](PF6)4 (1, 2, and 3) have been synthesized. Cyclic voltammetry of the complexes are consistent with one Ru(II)-centered oxidation and three ligand-centered reductions. Photophysical behaviors are investigated by UV–Vis absorption and fluorescence spectrometry. The three complexes show metal-to-ligand charge transfer absorption at 445–453 nm and emission at 571–593 nm.

Three novel bridging ligands and corresponding dinuclear Ru(II) complexes have been synthesized. These complexes exhibit abundant electrochemical properties, show characteristic MLCT absorption band at 445–453 nm and emission at 571–593 nm.Figure optionsDownload as PowerPoint slide