Stimuli-Responsive Metal-Organic Framework (MOF) with Chemo-Switchable Properties for Colorimetric Detection of CHCl3.
Stimuli-Responsive Metal-Organic Framework (MOF) with Chemo-Switchable Properties for Colorimetric Detection of CHCl3.
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DOI：
10.1002/chem.201702127
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发表时间：
2017-09
期刊：
影响因子：
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通讯作者：
S. Razavi;Mohammad Yaser Masoomi;A. Morsali
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文献类型：
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作者：
S. Razavi;Mohammad Yaser Masoomi;A. Morsali
以3,6-二（吡啶-4-酰基）-1,4-二氢-1,2,4,5-四嗪（H2 DPT）为柱状间隔剂，4,4′-氧双苯甲酸（H2 OBA）为二羧酸连接剂，制备了一种功能可转换的柱状金属有机骨架（MOF）， [Zn(OBA)(H2 DPT)0.5]⋅DMF (TMU-34)，作为刺激响应型MOF传感器。超声化学合成的TMU-34粉体已被用于挥发性有机化合物（VOCs）的检测。结果表明，TMU-34可以作为一种固态、裸眼化学传感器用于液相和气相氯仿的检测。TMU-34是一种快速反应的化学可切换MOF，在其他VOCs存在的情况下，暴露于氯仿后，通过二氢四氮向四氮的可逆动态转化，从黄色到粉红色发生了显著的颜色变化。尽管其他基于mof的比色传感器在不同分析物存在时显示出广泛的颜色变化，但TMU-34仅在氯仿存在时才会发生颜色变化。根据紫外/可见光谱和核磁共振光谱的研究，提出了观察到的颜色变化的机制。这些观察结果表明，TMU-34是氯仿高选择性和高灵敏度检测最有前途的候选者之一。
The ligands 3,6-di(pyridin-4-yl)-1,4-dihydro-1,2,4,5-tetrazine (H2 DPT), as a pillar spacer, and 4,4'-oxybis(benzoic acid) (H2 OBA), as a dicarboxylate linker, have been used to develop a dihydrotetrazine-functionalized pillared metal-organic framework (MOF), [Zn(OBA)(H2 DPT)0.5 ]⋅DMF (TMU-34), as a functionally convertible stimuli-responsive MOF-based sensor. Sonochemically synthesized TMU-34 powder has been employed in the sensing of volatile organic compounds (VOCs). The results show that TMU-34 can act as a solid-state, naked-eye visual chemosensor for the detection of chloroform in the liquid and gas phases. TMU-34, as a chemo-switchable MOF with rapid response, undergoes a significant color change from yellow to pink through reversible dynamic conversion of dihydrotetrazine into tetrazine upon exposure to chloroform in the presence of other VOCs. Whereas other colorimetric MOF-based sensors show a wide range of color changes in the presence of different analytes, TMU-34 undergoes a color change only in the presence of chloroform. A mechanism for the observed color change is proposed on the basis of UV/Vis and 1 H NMR spectroscopic studies. These observations reveal that TMU-34 represents one of the most promising candidates for the highly selective and sensitive detection of chloroform.