Continuous structure modification of metal-organic framework glasses via halide salts

Authors:
Open Access
Publisher website
Google Scholar
Abstract
Melting and glass formation of metal-organic frameworks (MOFs) allow them to be processed into bulk materials. However, two major challenges remain: only a small fraction of MOF crystals undergo melting and glass-formation, and no well-established strategies exist for tuning MOF glass structures and properties. Here, we address both challenges through co-melting of zeolitic imidazole frameworks (ZIFs), a subset of MOFs, with heterocycle-based halide salts. The salt acts as a chemical “modifier”, akin to the role of alkali modifiers in traditional silicate glasses, e.g., allowing the melting of ZIF-8 that otherwise decomposes prior to melting. Through experimental and computational analyses, we show that the salts depolymerize the ZIFs, enabling continuous tuning of the fraction of bridging to non-bridging imidazolate linkers and, thereby, the thermal and mechanical properties. The proposed strategy enables diversification of MOF glass chemistry, tunable structures and properties, and ultimately an increased number of glass-forming MOFs with improved functionalities.
Funding Information
  • Ministry of Science, Innovation and Higher Education | Styrelsen for Forskning og Innovation (8144-00002)
  • Danish e-Infrastructure Cooperation (DeiC-AAU-N5-000006)
  • Carlsbergfondet (CF21-0371, CF20–0364)
  • Deutsches Elektronen-Synchrotron (I-20230857 EC)
  • China Scholarship Council (202206890034)
  • Novo Nordisk Fonden (NNF22OC0076002, NNF220C0075797)

This publication has 62 references indexed in Scilit: