Investigating the melting behaviour of polymorphic zeolitic imidazolate frameworks
Investigating the melting behaviour of polymorphic zeolitic imidazolate frameworks
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DOI：
10.1039/d0ce00408a
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发表时间：
2020-06-07
期刊：
影响因子：
3.1
通讯作者：
Bennett, Thomas D.
中科院分区：
文献类型：
--
作者：
Bumstead, Alice M.;Rios Gomez, Maria Laura;Bennett, Thomas D.
近年来，人们对金属有机骨架（MOFs）的非晶态结构的研究越来越感兴趣。特别关注的是熔融淬火的MOF玻璃。在这项工作中，为了提高我们的理解的影响熔融的因素，四个密切相关的沸石咪唑骨架（ZIF）的热响应进行了研究。吸电子配体被发现降低熔融和玻璃化转变温度，提供了一个有前途的策略，以改善在液态的MOFs的加工性。至关重要的是，致密的框架似乎是熔化所必需的，它们的存在也引发开孔框架的熔化。这为制备新型MOF液体和玻璃开辟了ZIF的丰富多态性景观。
Recently, there has been growing interest in the amorphous states of metal-organic frameworks (MOFs). Particular focus has been given to melt-quenched MOF glasses. In this work, to improve our understanding of the factors influencing melting, the thermal response of four closely related zeolitic imidazolate frameworks (ZIFs) was studied. Electron withdrawing ligands were found to lower both the melting and glass transition temperatures, providing a promising strategy for improving the processability of MOFs in the liquid state. Crucially, dense frameworks appear to be essential for melting, with their presence also initiating the melting of open pore frameworks. This opens up the rich polymorphic landscape of ZIFs to the preparation of novel MOF liquids and glasses.