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Luminescent group 12 metal tetracarboxylate networks as probe for metal ions

机译：发光的12族金属四羧酸盐网络作为金属离子的探针

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摘要

Hydrothermal in situ decomposition of DMF generated three [NH2(CH3)(2)](+) cation templated anionic zinc and cadmium terphenyl-3,2 '',5 '',3'-tetracarboxylate (tpta) frameworks. Compound 1 shows a kgd topological layer constructed by 6-connected paddlewheel-type [Zn-2(CO2)(4)] SUBs and 3-connected tpta groups. Compound 2 has a 3D sra network constructed by the zigzag chains of metal centers and tpta groups. Compound 3 adopts a new (4,7)-connected topological network with four types of nodes. Compounds 1-3 show two blue phosphorescent emission bands attributed to ligand centered transitions perturbed by metal ions, which displays significant temperature-dependent behavior. The higher energy emissions are red-shifted and weakened with increasing temperature, while the lower energy emissions increase in intensity and finally become the main emission bands; the CIE coordinates for 1 are changed with decreasing temperature from blue to greenish blue. Interestingly, 1 could selectively detect traces of Ca2+ ions at ppm level in a pyridine suspension, which makes it more suitable to be a luminescent probe for sensing Ca+ ions.
机译：DMF的水热原位分解生成了三个[NH2（CH3）（2）]（+）阳离子模板化的阴离子锌和3,2''，5''，3'-四羧酸盐（tpta）骨架的镉镉。化合物1显示了由6个连接的桨轮型[Zn-2（CO2）（4）] SUB和3个连接的tpta基构成的kgd拓扑层。化合物2具有由金属中心和tpta基团的锯齿形链构成的3D sra网络。化合物3采用新的（4,7）连接的拓扑网络，具有四种类型的节点。化合物1-3显示了两个蓝色磷光发射带，这归因于受金属离子干扰的以配体为中心的跃迁，这显示出明显的温度依赖性行为。较高的能量排放随温度升高而红移并减弱，而较低的能量排放强度增加并最终成为主要的辐射带; 1的CIE坐标随温度从蓝色降低到绿色蓝色而变化。有趣的是，1可以选择性地检测到吡啶悬浮液中ppm级Ca2 +离子的痕迹，这使其更适合用作检测Ca +离子的发光探针。

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