Ruthenium and rhenium complexes of fluorene-based bipyridine ligands: Synthesis, spectra, and electrochemistry

Citation
Krj. Thomas et al., Ruthenium and rhenium complexes of fluorene-based bipyridine ligands: Synthesis, spectra, and electrochemistry, ORGANOMETAL, 20(3), 2001, pp. 557-563
Citations number
42
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
ORGANOMETALLICS
ISSN journal
0276-7333 → ACNP
Volume
20
Issue
3
Year of publication
2001
Pages
557 - 563
Database
ISI
SICI code
0276-7333(20010205)20:3<557:RARCOF>2.0.ZU;2-6
Abstract
Bipyridine ligands featuring fluorene and ferrocene in the conjugation chai n were synthesized by Pd(II)/Cu(I)-catalyzed Sonogashira coupling reactions , and their complexation behavior was investigated. The octahedral complexe s formed by refluxing Ru(bpy)(2)Cl-2 and Re(CO)(5)Cl with the ligands in et hanol or benzene were characterized by NMR,electronic spectra, fluorescence spectra, mass spectra, elemental analyses, and electrochemical studies. Th e bipyridine ligands and the complexes except the ferrocene-containing comp ounds are luminescent at room temperature. The luminescence in the rutheniu m complexes is possibly from a MLCT state, and the fluorescence due to the ligand is completely quenched. When: compared to the Ru(bpy)(3)(2+), the ru thenium complexes studied in this work exhibit longer lifetimes, which prob ably stems from the delocalization of charge into the extended fluorene con jugation. The crystal structure of a ferrocenyl fluorene derivative is also reported.