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Meltable, Glass-Forming, Iron Zeolitic Imidazolate Frameworks.

ABSTRACT: 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.

SUBMITTER: Leon-Alcaide L

PROVIDER: S-EPMC10214446 | biostudies-literature | 2023 May

REPOSITORIES: biostudies-literature

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Meltable, Glass-Forming, Iron Zeolitic Imidazolate Frameworks.

León-Alcaide Luis L Christensen Rasmus S RS Keen David A DA Jordá José L JL Brotons-Alcázar Isaac I Forment-Aliaga Alicia A Mínguez Espallargas Guillermo G

Journal of the American Chemical Society 20230509 20

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 ...[more]

PMID: 37158707

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