Abstract
Bipyridine ligands featuring fluorene and ferrocene in the conjugation chain were synthesized by Pd(II)/Cu(I)-catalyzed Sonogashira coupling reactions, and their complexation behavior was investigated. The octahedral complexes formed by refluxing Ru(bpy)2Cl2 and Re(CO)5Cl with the ligands in ethanol or benzene were characterized by NMR, electronic spectra, fluorescence spectra, mass spectra, elemental analyses, and electrochemical studies. The bipyridine ligands and the complexes except the ferrocene-containing compounds are luminescent at room temperature. The luminescence in the ruthenium complexes is possibly from a MLCT state, and the fluorescence due to the ligand is completely quenched. When compared to the Ru(bpy)32+, the ruthenium complexes studied in this work exhibit longer lifetimes, which probably stems from the delocalization of charge into the extended fluorene conjugation. The crystal structure of a ferrocenyl fluorene derivative is also reported.
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