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Sadakiyo, Masaaki; Kasai, Hidetaka; Kato, Kenichi; Takata, Masaki; Yamauchi, Miho
Journal of the American Chemical Society, 02/2014, Volume: 136, Issue: 5Journal Article
We demonstrate a metal–organic framework (MOF) design for the inclusion of hydroxide ions. Salt inclusion method was applied to an alkaline-stable ZIF-8 (ZIF = zeolitic imidazolate framework) to introduce alkylammonium hydroxides as ionic carriers. We found that tetrabutylammonium salts are immobilized inside the pores by a hydrophobic interaction between the alkyl groups of the salt and the framework, which significantly increases the hydrophilicity of ZIF-8. Furthermore, ZIF-8 including the salt exhibited a capacity for OH– ion exchange, implying that freely exchangeable OH– ions are present in the MOF. ZIF-8 containing OH– ions showed an ionic conductivity of 2.3 × 10–8 S cm–1 at 25 °C, which is 4 orders of magnitude higher than that of the blank ZIF-8. This is the first example of an MOF-based hydroxide ion conductor.
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