Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 19, Issue 22, Pages 7049-7055Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201300216
Keywords
amorphous materials; ball milling; iodine; metalorganic frameworks; zeolites
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Funding
- EPSRC, U.K.
- European Research Council
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The I2-sorption and -retention properties of several existing zeolitic imidazolate frameworks (ZIF-4, -8, -69) and a novel framework, ZIF-mnIm ([Zn(mnIm)2]; mnIm=4-methyl-5-nitroimidazolate), have been characterised using microanalysis, thermogravimetric analysis and X-ray diffraction. The topologically identical ZIF-8 ([Zn(mIm)2]; mIm=2-methylimidazolate) and ZIF-mnIm display similar sorption abilities, though strikingly different guest-retention behaviour upon heating. We discover that this guest retention is greatly enhanced upon facile amorphisation by ball milling, particularly in the case of ZIF-mnIm, for which I2 loss is retarded by as much as 200 degrees C. It is anticipated that this general approach should be applicable to the wide range of available metalorganic framework-type materials for the permanent storage of harmful guest species.
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