A superior fluorescent sensor for Al3+ and UO22+ based on a Co(II) metal-organic framework with exposed pyrimidyl Lewis base sites
A superior fluorescent sensor for Al3+ and UO22+ based on a Co(II) metal-organic framework with exposed pyrimidyl Lewis base sites
复制标题
基于具有暴露的嘧啶基路易斯碱位的 Co(II) 金属有机骨架的 Al3 和 UO22 的优异荧光传感器
DOI：
10.1039/c7ta01546a
复制
发表时间：
2017-07-07
影响因子：
11.9
通讯作者：
Sun, Di
中科院分区：
文献类型：
--
作者：
Chen, Wen-Miao;Meng, Xiao-Ling;Sun, Di
在溶剂热条件下，合成了一种新型的3DPCU Co(II)金属有机骨架化合物[Co-2(Dmimpym)(NDA)(2)](N)(1；dmimpym=4，6-二(2-甲基咪唑-1-基)-嘧啶，H(2)NDA=1，4-萘二甲酸)。化合物1具有一个基于[Co-2(COO)(4)]桨轮二次建筑单元(SBU)的2重互穿6连接PCU网络。它含有暴露的嘧啶刘易斯碱位，具有多孔性，在固态下表现出基于配体的蓝色发射，这使得它适合作为检测金属离子的荧光传感器。荧光滴定实验表明，与其他金属离子相比，1对Al3+具有很高的选择性，发射增强，检测下限低至0.7微米。重要的是，1可以循环至少5次而不损失发射信号。此外，1能够通过荧光猝灭检测到低浓度的铀酰离子。本研究为通过配体的剪裁实现MOF作为发光传感器的实际应用奠定了基础，并为低成本过渡金属基MOF传感器的发展奠定了基础。
A robust 3D pcu Co(II) metal-organic framework (MOF) based on a designed bent pyrimidyl-biimidazole ligand, [Co-2(dmimpym)(nda)(2)](n) (1; dmimpym = 4,6-di(2-methyl-imidazol-1-yl)-pyrimidine, H(2)nda = 1,4-naphthalenedicarboxylic acid), was successfully synthesized under solvothermal conditions and characterized using single-crystal X-ray diffraction. Compound 1 has a 2-fold interpenetrated 6-connected pcu network based on a [Co-2(COO)(4)] paddle-wheel secondary building unit (SBU). It contains exposed pyrimidyl Lewis base sites, has porosity, and exhibits ligand-based blue emission in the solid state, which render it suitable as a fluorescent sensor for the detection of metal ions. Fluorescence titration experiments reveal that 1 is highly selective for Al3+ with exclusively enhanced emission as compared to other metal ions, and the limit of detection (LOD) reaches as low as 0.7 mu M. Importantly, 1 can be cycled at least five times without the loss of emission signals. Moreover, 1 is able to detect low concentration of uranyl ions via fluorescence quenching. The present study sheds light on the realization of the practical application of MOFs as luminescent sensors via tailoring of the ligand and extends the way towards low-cost transition metal-based MOF sensors.