新型香豆素二羧酸铕配合物具有丰富的化学形态和可调谐的发光性能。

Department of Pharmacy, University of Pisa, Via Bonanno Pisano 6, 56126 Pisa, Italy.

Department of Chemistry and Industrial, University of Pisa, Via G. Moruzzi 3, 56126 Pisa, Italy.

Molecules. 2021 Feb 26;26(5):1265. doi: 10.3390/molecules26051265.

Europium (III) luminescent chelates possess intrinsic photophysical properties that are extremely useful in a wide range of applications. The lack of examples of coumarin-based lanthanide complexes is mainly due to poor photo-sensitization attempts. However, with the appeal of using such a versatile scaffold as antenna, especially in the development of responsive molecular probes, it is worth the effort to research new structural motifs. In this work, we present a series of two new tris coumarin-dipicolinate europium (III) complexes, specifically tailored to be either a mono or a dual emitter, tuning their properties with a simple chemical modification. We also encountered a rich chemical speciation in solution, studied in detail by means of paramagnetic NMR and emission spectroscopy.

铕（III）发光螯合物具有内在的光物理性质，在广泛的应用中非常有用。基于香豆素的镧系配合物缺乏实例，主要是由于光敏化尝试不佳。然而，使用这种多功能支架作为天线的吸引力，特别是在响应性分子探针的开发中，值得努力研究新的结构基序。在这项工作中，我们提出了一系列两个新的三香豆素-二吡啶酸铕（III）配合物，专门设计为单或双发射器，通过简单的化学修饰来调整其性质。我们还在溶液中遇到了丰富的化学形态，通过顺磁 NMR 和发射光谱详细研究。