Feixiang Cheng, Chixian He, Hongju Yin
Jan 21, 2014
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Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-Metal Chemistry
Abstract
Two tetrapodal ligands L1 and L2 containing 4,5-diazafluorene fragments have been prepared and characterized. Both ligands are composed of two kinds of nonequivalent coordinating sites. Ligand L1 consists of the 4-(4,5-diazafluoren-9-ylimino)phenoxy and 4,5-diazafluoren-9-yliminoxy moieties, ligand L2 involves the 2-(4,5-diazafluoren-9-ylimino)phenoxy and 4,5-diazafluoren-9-yliminoxy moieties. The Ru(II) complexes [(bpy)8Ru4(L1)](PF6)8 and [(bpy)8Ru4(L2)](PF6)8 (bpy = 2,2′-bipyridine) have been synthesized by refluxing Ru(bpy)2Cl2·2H2O and each ligand in 2-methoxyethanol. Both complexes exhibit metal-to-ligand charge transfer absorptions at around 443 nm, and emission at around 577 nm. Electrochemical studies of both complexes display one Ru(II)-centered oxidation at around 1.32 V and four ligand-centered reductions.