Synthesis, photophysical, and electrochemical properties of ruthenium(II) polypyridyl complexes containing open-chain crown ether

Abstract

Four polypyridyl bridging ligands BL1-4 containing open-chain crown ether, where BL1-3 formed by the condensation of 4,5-diazafluoren-9-oxime with diethylene glycol di-p-tosylate, triethylene glycol di-p-tosylate, and tetraethylene glycol di-p-tosylate, respectively. BL4 formed by the reaction of 4-(1,10-phenanthrolin-5-ylimino) methylphenol with triethylene glycol di-ptosylate, have been synthesized. Reaction of Ru(bpy)2Cl2·2H2O with BL, respectively, afforded four bimetallic complexes [(bpy)2RuBL 1-4Ru(bpy)2]4+ as [PF6]- salts. Electrochemistry of these complexes is consistent with one Ru II-based oxidation and several ligand-based reductions. These complexes show metal-to-ligand charge transfer absorption at 439-452 nm and emission at 570-597 nm. © 2008 Wiley-VCH Verlag GmbH & Co. KGaA.