Rational design of metallophosphors with tunable aggregation-induced phosphorescent emission and their promising applications in time-resolved luminescence assay and targeted luminescence imaging of cancer cells
作者:Shujuan Liu、Huibin Sun、Yun Ma、Shanghui Ye、Xiangmei Liu、Xinhui Zhou、Xin Mou、Lianhui Wang、Qiang Zhao、Wei Huang
DOI:10.1039/c2jm34512a
日期:——
A series of Pt(II) complexes with different N⁁O ligands have been synthesized and characterized by NMR, mass spectroscopy, and X-ray diffraction studies. All complexes are non-emissive in dilute solution. Interestingly, they exhibit aggregation-induced phosphorescent emission (AIPE) with an absolute quantum efficiency of up to 38% in the crystal state. In addition, their AIPE properties can be tuned significantly by changing the chemical structures of N⁁O ligands. Furthermore, an AIPE mechanism of “restricted distortion of excited-state structure (RDES)” was proposed through experimental and theoretical investigations, which provided a rational design strategy for metallophosphors with tunable aggregation-induced phosphorescent emission. Considering their excellent emissive properties in aggregation state, the promising applications of these AIPE-active Pt(II) complexes in time-resolved luminescence assay utilizing the long emission lifetime of phosphorescent signal and targeted luminescence imaging of cancer cells have been demonstrated.
我们合成了一系列具有不同 N⁁O 配体的铂(II)配合物,并通过核磁共振、质谱和 X 射线衍射研究对其进行了表征。所有配合物在稀释溶液中都不发光。有趣的是,它们在晶体状态下表现出聚集诱导磷光发射(AIPE),绝对量子效率高达 38%。此外,通过改变 N⁁O配体的化学结构,它们的 AIPE 特性可以得到显著调整。此外,通过实验和理论研究,提出了 "激发态结构受限畸变(RDES)"的 AIPE 机制,为具有可调聚集诱导磷光发射的金属磷酸盐提供了合理的设计策略。考虑到这些 AIPE 活性铂(II)复合物在聚集态下的优异发射特性,它们在利用磷光信号的长发射寿命进行时间分辨发光检测以及对癌细胞进行靶向发光成像方面的应用前景十分广阔。