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

摘要

Three polypyridyl bridging ligands cis-di(4,5-diazafluoren-9-ylimino)dibenzo-18-crown-6 (BL~1), trans-di(4,5-diazafluoren-9-ylimino)dibenzo-18-crown-6 (BL~2), and 1,4,7,10,13,16-hexaoxacycloctadecyl[2,3: 11,12]bis-dipyrido[3,2-a:2'3'-c]phenazine (BL~3), and corresponding dinuclear Ru(II) complexes [(bpy)2-RuBL~(1-3)Ru(bpy)2](PF6)4 (1, 2, and 3) have been synthesized. Cyclic voltammetry of the complexes are consistent with one Ru(H)-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.