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A novel water vapor sensor with 3-D pillared metal--organic framework and 2-D breathing mode
  • +3
  • Jin-Shuang Guo,
  • Yu-Chuan Zhao,
  • Xiao-Chen Sun,
  • Jun-Chao Ma,
  • Xue-bo Li,
  • Guo-Cong Guo
Jin-Shuang Guo
Shandong University of Political Science and Law
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Yu-Chuan Zhao
Shandong Academy of Environmental Sciences Environmental Testing Co., LTD
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Xiao-Chen Sun
Jinan Lixia District People's Hospital
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Jun-Chao Ma
Shandong University of Political Science and Law
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Xue-bo Li
Shandong University of Political Science and Law

Corresponding Author:[email protected]

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Guo-Cong Guo
Chinese Academy of Sciences Fujian Institute of Research on the Structure of Matter
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Abstract

In this work, we designed and synthesized two new 3-D pillared metal–organic frameworks (MOFs) [Cd2(adc)2(bpp)3∙4H2O]n (1) and [Cd2(adc)2(bpp)3]n (1b) with a 2-D breathing mode of reversible dehydration–rehydration. The dynamic behavior between 1 and 1b was detected by in situ single-crystal XRD analysis, which demonstrated that this 3-D pillared MOF contracted and expanded in two dimensions accompanied by dehydration–rehydration. Additionally, 1b exhibited faster water vapor response compared to commercial silica gel desiccant at normal temperature (21 °C) and humidity (RH% 50), which was detected by in situ IR. Therefore, the results suggests that this kind of flexible 3-D pillared metal–organic framework of 1 and 1b would be a reliable sensor for monitoring water vapor. (H2adc = 4,4’-azodibenzoic acid, bpp = 1,3-di(4-pyridyl)propane)