Preparation, Spectroscopic, and Electrochemical Properties of Two 4,5-Diazafluorene-Containing Ruthenium(II) Complexes: Bridging Ligands Composed of Two Kinds of Nonequivalent Coordinating Sites
摘要:
Two tetrapodal ligands L-1 and L-2 containing 4,5-diazafluorene fragments have been prepared and characterized. Both ligands are composed of two kinds of nonequivalent coordinating sites. Ligand L-1 consists of the 4-(4,5-diazafluoren-9-ylimino)phenoxy and 4,5-diazafluoren-9-yliminoxy moieties, ligand L-2 involves the 2-(4,5-diazafluoren-9-ylimino)phenoxy and 4,5-diazafluoren-9-yliminoxy moieties. The Ru(II) complexes [(bpy)(8)Ru-4(L-1)](PF6)(8) and [(bpy)(8)Ru-4(L-2)](PF6)(8) (bpy = 2,2-bipyridine) have been synthesized by refluxing Ru(bpy)(2)Cl-2 center dot 2H(2)O and each ligand in 2-methoxyethanol. Both complexes exhibit metal-to-ligand charge transfer absorptions at around 443nm, and emission at around 577nm. Electrochemical studies of both complexes display one Ru(II)-centered oxidation at around 1.32V and four ligand-centered reductions.
Preparation, Spectroscopic, and Electrochemical Properties of Two 4,5-Diazafluorene-Containing Ruthenium(II) Complexes: Bridging Ligands Composed of Two Kinds of Nonequivalent Coordinating Sites
摘要:
Two tetrapodal ligands L-1 and L-2 containing 4,5-diazafluorene fragments have been prepared and characterized. Both ligands are composed of two kinds of nonequivalent coordinating sites. Ligand L-1 consists of the 4-(4,5-diazafluoren-9-ylimino)phenoxy and 4,5-diazafluoren-9-yliminoxy moieties, ligand L-2 involves the 2-(4,5-diazafluoren-9-ylimino)phenoxy and 4,5-diazafluoren-9-yliminoxy moieties. The Ru(II) complexes [(bpy)(8)Ru-4(L-1)](PF6)(8) and [(bpy)(8)Ru-4(L-2)](PF6)(8) (bpy = 2,2-bipyridine) have been synthesized by refluxing Ru(bpy)(2)Cl-2 center dot 2H(2)O and each ligand in 2-methoxyethanol. Both complexes exhibit metal-to-ligand charge transfer absorptions at around 443nm, and emission at around 577nm. Electrochemical studies of both complexes display one Ru(II)-centered oxidation at around 1.32V and four ligand-centered reductions.