Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, 781039 Assam, India.
Dalton Trans. 2020 Sep 22;49(36):12565-12573. doi: 10.1039/d0dt02491k.
Here, we present a new diacetoxy-functionalized UiO-66 metal-organic framework (MOF) for the trace level detection of hydrazine in water. The MOF material (1) was solvothermally prepared by the reaction between ZrOCl2·8H2O and 2,5-diacetoxy-1,4-benzenedicarboxylic acid (H2BDC-(OCOCH3)2). The desolvated material (1') showed a highly selective fluorescent turn-on signal towards hydrazine in water, which can be visualized by the naked eye under a UV lamp. Within 1 min of hydrazine addition, there was 14-fold fluorescence enhancement. The probe can detect hydrazine up to the nanomolar level (detection limit = 78.8 nM) in water. This detection limit is the lowest among MOF-based fluorescent probes for hydrazine. The material was also utilized for the sensing of hydrazine in paper strips and environmental water samples. Hydrazine-selective deprotection of ester groups anchored with the ligand is the principal reason behind the switch-on nature of sensing.
在这里，我们提出了一种新的二乙酰氧基功能化 UiO-66 金属有机骨架（MOF），用于痕量水中肼的检测。MOF 材料（1）通过 ZrOCl2·8H2O 和 2,5-二乙酰氧基-1,4-苯二甲酸（H2BDC-（OCOCH3）2）之间的溶剂热反应制备。脱溶剂材料（1'）在水中对肼表现出高度选择性的荧光开启信号，可以在紫外灯下用肉眼观察到。肼加入 1 分钟内，荧光增强了 14 倍。该探针可在水中检测到低至纳摩尔级别的肼（检测限=78.8 nM）。这一检测限是基于 MOF 的肼荧光探针中最低的。该材料还用于纸条和环境水样中肼的传感。与配体相连的酯基的肼选择性去保护是传感开关性质的主要原因。
