State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, Fujian, P. R. China.
Chemistry. 2018 May 11;24(27):6936-6940. doi: 10.1002/chem.201801132. Epub 2018 Apr 20.
Luminescent lanthanide-containing compounds have a lot of stimulating applications. However, the fine-tuning of the optical properties of multi-nuclear lanthanide edifices is still a big challenge. We report here the coordination self-assembly of a group of bright luminescent lanthanide organic polyhedra (LOPs) with record high emission quantum yields, by using two fully-conjugated ligands featuring the triazole-pyridine-amido (tpa) chelating moiety, easily-accessible from the "Click" reaction. The self-assembled LOPs are characterized by NMR spectroscopy, high-resolution ESI-TOF-MS, and X-ray crystallography. Interestingly, inter-metal energy transfer (ET) is confirmed on the mixed-lanthanide polyhedral molecules, though the metal centers are separated nearly 2 nm apart. A feasible ratiometric luminescent thermometer, with work range from cryogenic to physiological temperatures, has been demonstrated with the mixed Eu/Tb LOPs. We envisage these molecular-level bright luminescent LOPs have great application potential in displaying, labelling/imaging, up-conversion materials etc.
含镧系元素的发光化合物具有许多令人兴奋的应用。然而，精细调节多核镧系元素建筑的光学性质仍然是一个巨大的挑战。我们在这里报告了一组具有创纪录的高发射量子产率的明亮镧系元素有机多面体（LOPs）的配位自组装，该自组装是通过使用两个完全共轭的配体实现的，这些配体具有三唑-吡啶-酰胺（tpa）螯合部分，可通过“点击”反应轻松获得。自组装的 LOPs 通过 NMR 光谱、高分辨率 ESI-TOF-MS 和 X 射线晶体学进行了表征。有趣的是，尽管金属中心彼此分离近 2nm，但在混合镧系多面体分子上确认了金属间能量转移（ET）。Eu/Tb LOPs 已被证明可用于工作范围从低温到生理温度的比率荧光温度计。我们设想这些分子水平的明亮发光 LOPs 在显示、标记/成像、上转换材料等方面具有巨大的应用潜力。
