具不同官能团钌(II)邻菲啰啉配合物氧淬灭性能的比较研究

Ruthenium(II) phenanthroline complexes with different functional groups: [Ru(bpy)₂ (phen-NO₂)] (PF₆)₂ (1), [Ru(bpy)₂ (phen-Br)] (PF₆)₂ (2), [Ru(bpy)₂ (phen-NH₂)](PF₆)₂ (3), [Ru(bpy)₂ (bphen)] (PF₆)₂ (4) (where bpy=2, 2'-bipyridyl, phen-NO₂=5-nitro-phenanthroline, phen-Br=5-bromo-phenanthroline, phen-NH₂=5-amino-phenanthroline, bphen=bathophenanthroline) were synthesized. They were characterized and analyzed by NMR, FTIR, elemental analysis and UV-Vis absorption and photoluminesence spectroscopy measurements, respectively. The investigations indicate that complexes 2~4 emit bright orange- red fluorescence and have intensely visible absorption in blue-purple region. Complexes 2~4 show the photophysics properties of high quantum efficiencies (Φ), long excited-state luminescence lifetime (τ), large Stocks shift (147~205 nm) and good oxygen-induced luminescence quenching properties (K_sv ≥ 3.5, (I₀/I)_max ≥ 4.0). Among them, complex 3 grafted by an amino functional group has a Φ of 10%, a τ of 381.8 ns, a K_sv of 3.49 and the maximum I₀/I factor of 4.33. However, complex 2 grafted by a bromine group shows higher Φ of 18%, longer luminescence τ of 635 ns, larger Ksv of 4.59 and the maximum I₀/I factor up to 5.29. These properties make it a promising fluorescence indicator applied in grafting and high performance optics oxygen sensor.