Synthesis of polypyridyl ruthenium complexes
with 2-(1-aryl)-1H-imidazo[4,5-f]-1,10-phenanthroline ligand and its
application for luminescent oxygen sensing
Synthesis of polypyridyl ruthenium complexes
with 2-(1-aryl)-1H-imidazo[4,5-f]-1,10-phenanthroline ligand and its
application for luminescent oxygen sensing
1.State Key Laboratory
of Fine Chemicals, School of Chemical Engineering, P.O. Box 40, 158
Zhongshan Road, Dalian University of Technology, Dalian 116012, China; 2.Department of Chemistry,
School of Chemical Engineering, Dalian University of Technology, 158
Zhongshan Road, Dalian 116012, China;
Abstract:Polypyridyl ruthenium (Ru) complexes 1–3 were prepared. Their photophysical properties were investigated by UV-Vis absorption and luminescence emission spectra. The luminescent lifetimes of these Ruthenium complex were prolonged by more than 5 folds (t = 2.50 ms for complex 3) when compared with the parent Ru complex 1 (t = 0.45 ms). We propose that the extended luminescent lifetime of complex 3 is due to the equilibrium between 3MLCT state and the pyrene localized 3π-π* triplet state (3IL). The luminescent O2-sensing property of the complexes in solution and the IMPEK-C polymer film were studied, and the O2 sensing was quantified with the two-site model. The oxygen-sensing property of the Ru complexes can be improved by 104-fold with extension of the luminescent lifetimes. For example, the quenching constant KSV was improved from 0.0023 Torr−1 of 1 to 0.2393 Torr−1 for 3. Our results demonstrated a versatile approach for the preparation of Ru (II) polypyridine complexes with extended luminescent lifetimes as functional materials, for example, for luminescent oxygen-sensing applications.