Alkali-ion-modified zeolitic imidazolate framework glasses
8 affiliations
- 1Fakultät für Chemie und Chemische Biologie , Technische Universität Dortmund , Dortmund , Germany
- 2School of Chemistry , University of Birmingham , Birmingham , UK
- 3Faculty of Mechanical Engineering ,
- 4Center for Interface-Dominated High Performance Materials (ZGH) , Ruhr-Universität Bochum , Bochum , Germany
- 5Department of Chemistry , SRM University-AP , Amaravati , India
- 6Yusuf Hamied Department of Chemistry , University of Cambridge , Cambridge , UK
- 7Department of Chemistry , TUM School of Natural Sciences , Technical University of Munich , Garching , Germany
- 8School of Metallurgy and Materials , University of Birmingham , Birmingham , UK
Abstract
Modifying glass compositions is key to creating silicate-based glasses for technologies including optical fibres, catalytic supports, protective coatings and separation membranes. Here we extend this concept to metal–organic framework (MOF) glasses by modifying the MOF glass former ZIF-62 with Li(bim) and Na(bim) as compatible glass modifiers (benzimidazolate, bim − ). Melt-quenching of physical mixtures with increasing Na(bim) content yields modified MOF glasses that exhibit a systematic decrease in the glass transition temperature ( T g ), accompanied by increased liquid fragility, configurational heat capacity at T g and density: paralleling silicate glass chemistry through partial network depolymerization. Structural and spectroscopic analysis, coupled with density-functional theory calculations, confirm that Na(bim) is incorporated homogeneously into the MOF glass framework rather than the pores and reveal the presence of undercoordinated sodium ion environments. Finally, extraction of the modifier by water treatment increases glass porosity, akin to established borosilicate glass processes. This work introduces a transferable approach for tailoring the structure and properties of MOF glasses.
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BibTeX
@article{kolodzeiski2026alkaliionmodified,
title = {{Alkali-ion-modified zeolitic imidazolate framework glasses}},
author = {Pascal Kolodzeiski and Benjamin M. Gallant and Lennard Richter and Mario Antonio T. Ongkiko and Carlo Franke and Aleksander Kostka and Wen‐Long Xue and Chinmoy Das and Jan-Benedikt Weiss and Elena Kolodzeiski and Thomas Kress and Gregor Kieslich and Tong Li and Andrew J. Morris and Dominik J. Kubicki and Sebastian Henke},
journal = {Lirias (KU Leuven)},
year = {2026},
month = aug,
doi = {10.1038/s41557-026-02115-8},
url = {https://lirias.kuleuven.be/handle/20.500.12942/793586},
note = {CC BY},
}
RIS
TY - JOUR
TI - Alkali-ion-modified zeolitic imidazolate framework glasses
AU - Pascal Kolodzeiski
AU - Benjamin M. Gallant
AU - Lennard Richter
AU - Mario Antonio T. Ongkiko
AU - Carlo Franke
AU - Aleksander Kostka
AU - Wen‐Long Xue
AU - Chinmoy Das
AU - Jan-Benedikt Weiss
AU - Elena Kolodzeiski
AU - Thomas Kress
AU - Gregor Kieslich
AU - Tong Li
AU - Andrew J. Morris
AU - Dominik J. Kubicki
AU - Sebastian Henke
PY - 2026
DA - 2026/08/01
JO - Lirias (KU Leuven)
DO - 10.1038/s41557-026-02115-8
UR - https://lirias.kuleuven.be/handle/20.500.12942/793586
AB - Modifying glass compositions is key to creating silicate-based glasses for technologies including optical fibres, catalytic supports, protective coatings and separation membranes. Here we extend this concept to metal–organic framework (MOF) glasses by modifying the MOF glass former ZIF-62 with Li(bim) and Na(bim) as compatible glass modifiers (benzimidazolate, bim − ). Melt-quenching of physical mixtures with increasing Na(bim) content yields modified MOF glasses that exhibit a systematic decrease in the glass transition temperature ( T g ), accompanied by increased liquid fragility, configurational heat capacity at T g and density: paralleling silicate glass chemistry through partial network depolymerization. Structural and spectroscopic analysis, coupled with density-functional theory calculations, confirm that Na(bim) is incorporated homogeneously into the MOF glass framework rather than the pores and reveal the presence of undercoordinated sodium ion environments. Finally, extraction of the modifier by water treatment increases glass porosity, akin to established borosilicate glass processes. This work introduces a transferable approach for tailoring the structure and properties of MOF glasses.
ER -