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 (Ksv ≥ 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 Ksv 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.
|Translated title of the contribution||Comparison Study of Oxygen Quenching of Ru(II) Phenanthroline Complexes with Different Functional Groups|
|Number of pages||7|
|Journal||Acta Chimica Sinica|
|Publication status||Published - 28 Mar 2012|
- Oxygen quenching
- Oxygen sensor
- Ru (II) complex