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首页> 外文期刊>Chemistry: A European journal >Lanthanoid/Alkali Metal beta-Triketonate Assemblies: A Robust Platform for Efficient NIR Emitters
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Lanthanoid/Alkali Metal beta-Triketonate Assemblies: A Robust Platform for Efficient NIR Emitters

机译：镧系元素/碱金属β-三酮酸酯组装体：高效NIR发射器的强大平台

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摘要

The reaction of hydrated lanthanoid chlorides with tribenzoylmethane and an alkali metal hydroxide consistently resulted in the crystallization of neutral tetranuclear assemblies with the general formula fLn(Ae center dot HOEt)(L)(4)](2) (Ln = Eu3+, Yb3+; Ae=Na+, K+, Rb+). Analysis of the crystal structures of these species revealed a coordination geometry that varied from a slightly distorted square antiprism to a slightly distorted triangular dodecahedron, with the specific geometrical shape being dependent on the degree of lattice solvation and identity of the alkali metal. The near-infrared (NIR)-emitting assemblies of Yb3+ and Er3+ showed remarkably efficient emission, characterized by significantly longer excited state lifetimes (tau(obs) P -37-47 vs for Yb and is for Er3+) when compared with the broader family of lanthanoid p-diketonate species, even in the case of perfluorination of the ligands. The Eu3+ assemblies show bright red emission and a luminescence performance (tau(obs), approximate to ms, phi(L)(Ln)approximate to 35-37%, eta(sens) approximate to 68-70%) more akin to the (beta-diketonate species. The results highlight that the beta-triketonate ligand offers a tunable and facile system for the preparation of efficient NIR emitters without the need for more complicated perfluorination or deuteration synthetic strategies.
机译：水合镧系元素氯化物与三苯甲酰甲烷和碱金属氢氧化物的反应始终导致具有通式fLn（Ae中心点HOEt）（L）（4）]（2）（Ln = Eu3 +，Yb3 +; Ae ＝ Na +，K +，Rb +）。对这些物种的晶体结构进行分析后发现，其配位几何形状从略微变形的方形反棱镜到略微变形的三角十二面体不等，具体的几何形状取决于晶格溶剂化程度和碱金属的身份。 Yb3 +和Er3 +的近红外（NIR）发射组件显示出显着有效的发射，与更广泛的族相比，其激发态寿命显着更长（tau（obs）P -37-47与Yb和Er3 +相比）即使在配体全氟化的情况下，也可以生成镧系对二酮酸酯类化合物。 Eu3 +组件显示出更亮的红色发射和发光性能（tau（obs）近似于ms，phi（L）（Ln）近似于35-37％，eta（sens）近似68-70％），与（β-二酮酸酯类。结果表明，β-三酮酸酯配体提供了可调谐且简便的系统，可用于制备有效的NIR发射体，而无需更复杂的全氟化或氘代合成策略。

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