High proton conductivity by a metal-organic framework incorporating Zn 8O clusters with aligned imidazolium groups decorating the channels

Susan Sen, Nisanth N. Nair, Teppei Yamada, Hiroshi Kitagawa, Parimal K. Bharadwaj

Research output: Contribution to journalArticlepeer-review

219 Citations (Scopus)

Abstract

A novel metal-organic framework, [{(Zn0.25)8(O)} Zn6(L)12(H2O)29(DMF) 69(NO3)2]n (1) {H2L = 1,3-bis(4-carboxyphenyl)imidazolium}, has been synthesized under solvothermal conditions in good yield. It shows a Zn8O cluster that is coordinated to six ligands and forms an overall three-dimensional structure with channels along the crystallographic a and b axes. The imidazolium groups of the ligand moiety are aligned in the channels. The channels are not empty but are occupied by a large number of DMF and water molecules. Upon heating, these solvent molecules can be removed without breakdown of the overall structure of the framework as shown by variable-temperature powder X-ray diffraction patterns. Of great interest is the fact that the compound exhibits high proton conductivity with a low activation energy that is comparable to those of Nafion presently used in fuel cells.

Original languageEnglish
Pages (from-to)19432-19437
Number of pages6
JournalJournal of the American Chemical Society
Volume134
Issue number47
DOIs
Publication statusPublished - Nov 28 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

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

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