Center for Chemistry of High-Performance &Novel Materials, State Key Laboratory of Chemical Engineering, Department of Chemistry, Zhejiang University, Hangzhou 310027, China.
Department of Chemistry, University at Buffalo, 359 Natural Sciences Complex, Buffalo, New York 14260, USA.
Nat Chem. 2015 Apr;7(4):342-8. doi: 10.1038/nchem.2201. Epub 2015 Mar 16.
Light-emitting materials, especially those with tunable wavelengths, attract considerable attention for applications in optoelectronic devices, fluorescent probes, sensors and so on. Many species evaluated for these purposes either emit as a dilute solution or on aggregation, with the former often self-quenching at high concentrations, and the latter falling dark when aggregation is disrupted. Here we preserve emissive behaviour at both low- and high-concentration regimes for two discrete supramolecular coordination complexes (SCCs). These tetragonal prismatic SCCs are self-assembled on mixing a metal acceptor, Pt(PEt3)2(OSO2CF3)2, with two organic donors, a pyridyl-decorated tetraphenylethylene and one of two benzene dicarboxylate species. The rigid organization of these fluorescence-active ligands imparts an emissive behaviour to dilute solutions of the resulting assemblies. Furthermore, on aggregation the prisms exhibit variable-wavelength visible-light emission, including rare white-light emission in tetrahydrofuran. The favourable photophysical properties and solvent-dependent aggregation behaviour provide a means to tune emission wavelengths.
发光材料，特别是那些具有可调波长的发光材料，因其在光电设备、荧光探针、传感器等方面的应用而受到广泛关注。许多为此目的而评估的物种要么在稀释溶液中发射，要么在聚集时发射，前者在高浓度时常常自猝灭，后者在聚集被破坏时变暗。在这里，我们为两种离散的超分子配位化合物（SCC）保留了在低浓度和高浓度两种情况下的发光行为。这些四方棱柱形 SCC 是通过混合金属受体 Pt(PEt3)2(OSO2CF3)2 和两个有机供体，一个吡啶修饰的四苯乙烯和两种苯二甲酸酯物种之一，自组装而成的。这些荧光活性配体的刚性组织赋予了所得组装体的稀溶液发光行为。此外，在聚集时，棱柱体表现出可变波长的可见光发射，包括在四氢呋喃中罕见的白光发射。有利的光物理性质和溶剂依赖性聚集行为提供了一种调节发射波长的方法。
