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.
制备了多
吡啶基
钌(Ru)配合物 1-3。通过紫外可见吸收光谱和发光发射光谱研究了它们的光物理特性。与母体 Ru 复合物 1(τ = 0.45 μs)相比,这些
钌复合物的发光寿命延长了 5 倍多(复合物 3 的发光寿命为 2.50 μs)。我们认为,复合物 3 的发光寿命延长是由于 3MLCT 状态和
芘局域 3π-π* 三重态(3IL)之间的平衡所致。研究了复合物在溶液和 IMPEK-C 聚合物薄膜中的发光 O2 传感特性,并利用双位点模型对 O2 传感进行了量化。随着发光寿命的延长,Ru 复合物的氧传感性能提高了 104 倍。例如,淬灭常数 K SV 从 1 的 0.0023 Torr-1 提高到了 3 的 0.2393 Torr-1。我们的研究结果表明,制备具有延长发光寿命的 Ru (II) 多
吡啶配合物是一种多功能方法,可用作功能材料,例如用于发光氧传感应用。