College of Science, School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China.
Dezhou University, Dezhou, Shandong 253023, China.
Dalton Trans. 2020 Nov 10;49(43):15473-15480. doi: 10.1039/d0dt03264f.
Two series of lanthanide-based metal-organic frameworks, namely {[Ln(BIPA-TC)0.5(DMA)2(NO3)]·DMA·H2O}n (1-Ln, Ln = Eu, Dy, Sm, Nd) and {[Ln2(BIPA-TC)1.5(DMA)3(H2O)2]·2DMA·2H2O}n (2-Ln, Ln = Eu, Dy, Sm, Nd), were successfully constructed via a solvent regulation strategy based on a π-electron rich tetra-carboxylate ligand (H4BIPA-TC). 1-Ln shows a 4-connected lvt topology with the point symbol of {42·84}, but 2-Ln displays a new 4,4,6-connected wxk1 topology with the point symbol of {43·83}4{46·66·83}2{86}. The solid-state luminescence property and the microporous nature of Eu-MOFs (1-Eu and 2-Eu) indicate that they can potentially be used as luminescent sensors. Fluorescence measurements indicate that Fe3+ exhibits the quenching effect for 1-Eu with the quenching efficiency of 93.1%. 2-Eu is the first MOF sensor for Mg2+ with the lowest detection limit of 1.53 × 10-10 mol L-1 and displays good recyclable capability. Simultaneously, in the presence of other metal ions (Ca2+, Mn2+, Co2+, Ni2+, Cu2+, Zn2+, Cd2+, Pd2+, Al3+, Cr3+and Fe3+), 2-Eu can maintain the selective sensing of Mg2+, indicating its potential for Mg2+ turn-on sensing.
两个系列的镧系金属-有机骨架，即{[Ln（BIPA-TC）0.5（DMA）2（NO3）]·DMA·H2O}n（1-Ln，Ln = Eu，Dy，Sm，Nd）和{[Ln2（BIPA-TC）1.5（DMA）3（H2O）2]·2DMA·2H2O}n（2-Ln，Ln = Eu，Dy，Sm，Nd），是通过基于π-电子富四羧酸配体（H4BIPA-TC）的溶剂调节策略成功构建的。1-Ln 具有 4 连接的 lvt 拓扑结构，点符号为{42·84}，而 2-Ln 显示出一种新的 4,4,6 连接的 wxk1 拓扑结构，点符号为{43·83}4{46·66·83}2{86}。Eu-MOFs（1-Eu 和 2-Eu）的固态发光性质和微孔性质表明它们可能被用作发光传感器。荧光测量表明，Fe3+对 1-Eu 具有猝灭作用，猝灭效率为 93.1%。2-Eu 是第一个用于 Mg2+的 MOF 传感器，最低检测限为 1.53×10-10molL-1，并且显示出良好的可回收能力。同时，在存在其他金属离子（Ca2+、Mn2+、Co2+、Ni2+、Cu2+、Zn2+、Cd2+、Pd2+、Al3+、Cr3+和 Fe3+）的情况下，2-Eu 可以保持对 Mg2+的选择性传感，表明其具有用于 Mg2+开启传感的潜力。
