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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

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Frontiers of Chemistry in 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 (τ = 2.50 μs for complex 3) when compared with the parent Ru complex 1 (τ = 0.45 μs). 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 K SV 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.

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Authors and Affiliations

  1. State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, P.O. Box 40, 158 Zhongshan Road, Dalian, 116012, China

    Shaomin Ji, Wanhua Wu, Wenting Wu, Qi Yang, Quan Wang, Xin Zhang, Yubo Wu & Jianzhang Zhao

  2. Department of Chemistry, School of Chemical Engineering, Dalian University of Technology, 158 Zhongshan Road, Dalian, 116012, China

    Huimin Guo

Authors
  1. Shaomin Ji
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  2. Wanhua Wu
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  3. Wenting Wu
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  4. Huimin Guo
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  5. Qi Yang
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  6. Quan Wang
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  7. Xin Zhang
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  8. Yubo Wu
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  9. Jianzhang Zhao
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Corresponding author

Correspondence to Jianzhang Zhao.

Additional information

Jianzhang ZHAO obtained his Ph.D. degree at Jilin University in 2000. Then he did research in South Korea (POSTECH), Germany (Max-Plank Research Unit of Protein Folding) and United Kingdom (University of Bath). In 2005, he took a position as a full professor at Dalian University of Technology. His current research interests include molecular sensors and photophysics, such as boronic acid sensors and oxygen sensors. More recently he focused on the study of phosphorescent metal complexes.

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Ji, S., Wu, W., Wu, W. et al. 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. Front. Chem. China 5, 193–199 (2010). https://doi.org/10.1007/s11458-010-0103-y

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  • DOI: https://doi.org/10.1007/s11458-010-0103-y

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