Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China.
University of the Chinese Academy of Sciences, Beijing 100049, China.
Molecules. 2021 Mar 18;26(6):1695. doi: 10.3390/molecules26061695.
Four lanthanide metal-organic frameworks (Ln-MOFs), namely {[MeNH][LnL]·2HO} (Ln = Eu , Tb , Dy , Gd ), have been constructed from a new tetradentate ligand 1-(3,5-dicarboxylatobenzyl)-3,5-pyrazole dicarboxylic acid (HL). These isostructural Ln-MOFs, crystallizing in the monoclinic 2/c space group, feature a 3D structure with 7.5 Å × 9.8 Å channels along the axis and the point symbol of {4.6.8} {4.6}. The framework shows high air and hydrolytic stability, which can keep stable after exposed to humid air for 30 days or immersed in water for seven days. Four MOFs with different lanthanide ions (Eu, Tb, Dy, and Gd) ions exhibit red, green, yellow, and blue emissions, respectively. The Tb-MOF emitting bright green luminescence can selectively and rapidly (<40 s) detect Fe in aqueous media via a fluorescence quenching effect. The detection shows excellent anti-inference ability toward many other cations and can be easily recognized by naked eyes. In addition, it can also be utilized as a rapid fluorescent sensor to detect acetone solvent as well as acetone vapor. Similar results of sensing experiments were observed from Eu-MOF. The sensing mechanism are further discussed.
四种镧系金属-有机框架（Ln-MOFs），即{[MeNH][LnL]·2HO}（Ln = Eu，Tb，Dy，Gd），是由一种新的四齿配体 1-（3,5-二羧基苯甲基）-3,5-吡唑二甲酸（HL）构建而成。这些同构的 Ln-MOFs，结晶于单斜 2/c 空间群，具有沿 轴的 7.5 Å × 9.8 Å 通道的 3D 结构，点符号为{4.6.8} {4.6}。该骨架具有高空气和水解稳定性，在暴露于潮湿空气 30 天或浸入水中 7 天后仍保持稳定。四个具有不同镧系离子（Eu，Tb，Dy 和 Gd）的 MOFs 分别发射红色、绿色、黄色和蓝色光。Tb-MOF 发射明亮的绿色荧光，通过荧光猝灭效应可以在水相中选择性和快速（<40 s）检测 Fe。该检测对许多其他阳离子具有出色的抗干扰能力，并且可以通过肉眼轻松识别。此外，它还可以用作快速荧光传感器来检测丙酮溶剂和丙酮蒸气。Eu-MOF 也观察到了类似的传感实验结果。进一步讨论了传感机制。
