Meltable, Glass-Forming, Iron Zeolitic Imidazolate Frameworks

We describe the first meltable iron-based zeolitic imidazolate framework (ZIF), denoted MUV-24. This material, elusive from direct synthesis, is obtained from the thermal treatment of [Fe3(im)6(Him)2], which yields Fe­(im)2 upon loss of the neutral imidazole molecules. Different crystalline phase tr...

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Bibliographic Details
Published inJournal of the American Chemical Society Vol. 145; no. 20; pp. 11258 - 11264
Main Authors León-Alcaide, Luis, Christensen, Rasmus S., Keen, David A., Jordá, José L., Brotons-Alcázar, Isaac, Forment-Aliaga, Alicia, Mínguez Espallargas, Guillermo
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 24.05.2023
Subjects
glass
heat
heat treatment
imidazole
liquids
vitrification
X-radiation
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Summary:We describe the first meltable iron-based zeolitic imidazolate framework (ZIF), denoted MUV-24. This material, elusive from direct synthesis, is obtained from the thermal treatment of [Fe3(im)6(Him)2], which yields Fe­(im)2 upon loss of the neutral imidazole molecules. Different crystalline phase transformations are observed upon further heating, until the material melts at 482 °C. Vitrification upon cooling of the liquid phase gives rise to the first Fe-metal–organic framework glass. X-ray total scattering experiments show that the tetrahedral environment of the crystalline solids is maintained in the glass, whereas nanoindentation measurements reveal an increase in Young’s modulus, in agreement with stiffening upon vitrification.
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content type line 23
ISSN:0002-7863
1520-5126
1520-5126
DOI:10.1021/jacs.3c01455