The role of Fe3+ ions in fluorescence detection of H2S by a bimetallic metal-organic framework
The role of Fe3+ ions in fluorescence detection of H2S by a bimetallic metal-organic framework
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DOI：
10.1016/j.jssc.2020.121434
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发表时间：
2020-08
影响因子：
3.3
通讯作者：
Zan Zhu;V. Natarajan;Wei-Ning Wang
中科院分区：
文献类型：
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作者：
Zan Zhu;V. Natarajan;Wei-Ning Wang
一种新颖的多功能存储器（即，FexAl 1-x-MIL）的荧光猝灭的探针，构建检测H2S的基础上的“打开”效应在水溶液中。有趣的是，在母体MOF Al-MIL-53-NH 2中，痕量的Al 3+被Fe 3+取代，导致在无规MOF中显著的荧光猝灭，这归因于Fe 3+和π-共轭的BDC-NH 2配体中的未配对电子之间的强配体到金属的电荷转移。经H2S处理后，Fe0.05Al0.95-MIL的荧光强度与H2S浓度（0-38.46 μM）呈良好的线性关系，表明Fe0.05Al0.95-MIL可用于H2S的定量检测。特别地，被S2−捕获的BDMOF中的Fe 3+促进了部分降解和随后的BDC-NH 2配体的释放，这些配体被确定为有助于荧光增强的真实的荧光团。这项研究为发光的CNOMOF设计提供了新的见解，并将扩大其在化学传感中的应用。
A novel bimetallic MOF (i.e., FexAl1-x-MIL) with fluorescence quenching in the probe, was constructed to detect H2S based on a “turn-on” effect in an aqueous system. Interestingly, a trace amount of Al3+replaced by Fe3+in the parent MOF Al-MIL-53-NH2causes significant fluorescence quenching in the bimetallic MOF, which is attributed to the strong ligand to metal charge transfer between unpaired electrons in Fe3+and π-conjugated BDC-NH2ligands. After H2S treatment, a fluorescence augmentation was observed, with a good linear relationship between H2S concentration (0–38.46 μM) and fluorescence intensity, indicating that Fe0.05Al0.95-MIL could be used for quantitative H2S detection. Particularly, Fe3+in the bimetallic MOF seized by S2−facilitated the partial degradation and subsequent release of BDC-NH2ligands, which were determined to be real fluorophores that contributed to the fluorescence enhancement. This study offers new insights into the luminescent bimetallic MOF design and would expand its application in chemical sensing.