A metal-organic framework-based material for electrochemical sensing of carbon dioxide

Jeremiah J. Gassensmith, Jeung Yoon Kim, James M. Holcroft, Omar K. Farha, J. Fraser Stoddart, Joseph T. Hupp, Nak Cheon Jeong

Research output: Contribution to journalArticlepeer-review

160 Citations (Scopus)


The free primary hydroxyl groups in the metal-organic framework of CDMOF-2, an extended cubic structure containing units of six Î-cyclodextrin tori linked together in cube-like fashion by rubidium ions, has been shown to react with gaseous CO2 to form alkyl carbonate functions. The dynamic covalent carbon-oxygen bond, associated with this chemisorption process, releases CO2 at low activation energies. As a result of this dynamic covalent chemistry going on inside a metal-organic framework, CO2 can be detected selectively in the atmosphere by electrochemical impedance spectroscopy. The as-synthesized CDMOF-2 which exhibits high proton conductivity in pore-filling methanolic media, displays a ∼550-fold decrease in its ionic conductivity on binding CO2. This fundamental property has been exploited to create a sensor capable of measuring CO2 concentrations quantitatively even in the presence of ambient oxygen.

Original languageEnglish
Pages (from-to)8277-8282
Number of pages6
JournalJournal of the American Chemical Society
Issue number23
Publication statusPublished - Jun 11 2014

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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