4 years ago

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
Ali Morsali, Sayed Ali Akbar Razavi, Mohammad Yaser Masoomi
The ligands 3,6-di(pyridin-4-yl)-1,4-dihydro-1,2,4,5-tetrazine (H2DPT), as a pillar spacer, and 4,4′-oxybis(benzoic acid) (H2OBA), as a dicarboxylate linker, have been used to develop a dihydrotetrazine-functionalized pillared metal–organic framework (MOF), [Zn(OBA)(H2DPT)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 1H 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. Selective probe for chloroform: A stimuli-responsive metal–organic framework, designated as TMU-34, with chemo-switchable properties and electronically active function in the visible region, has been applied in the colorimetric detection of volatile organic compounds. TMU-34 shows unique selectivity and sensitivity towards chloroform in both the liquid and gas phases (see figure).

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/chem.201702127

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