Metal-organic framework (MOF) glasses are an emerging class of glasses which complement traditional inorganic, organic and metallic counterparts due to their hybrid nature. Although a few zeolitic imidazolate frameworks have been made into glasses, how to melt and quench the largest subclass of MOFs, metal carboxylate frameworks, into glasses remains challenging. Here, we develop a strategy by grafting the zwitterions on the carboxylate ligands and incorporating organic acids in the framework channels to enable the glass formation. The charge delocalization of zwitterion-acid subsystem and the densely filled channels facilitate the coordination bonding mismatch and thus reduce the melting temperature. Following melt-quenching realizes the glass formation of a family of carboxylate MOFs (UiO-67, UiO-68 and DUT-5), which are usually believed to be un-meltable. Our work opens up an avenue for melt-quenching porous molecular solids into glasses.

金属有机框架（MOF）玻璃是一类新兴的玻璃，由于其混合性质，它补充了传统的无机、有机和金属玻璃。尽管一些沸石咪唑酯骨架已制成玻璃，但如何将 MOF 的最大子类金属羧酸盐骨架熔化并淬火成玻璃仍然具有挑战性。在这里，我们开发了一种策略，通过将两性离子接枝到羧酸盐配体上并将有机酸纳入框架通道中以实现玻璃形成。两性离子酸子系统的电荷离域和密集填充的通道促进了配位键失配，从而降低了熔化温度。随后的熔融淬火实现了一系列羧酸盐 MOF（UiO-67、UiO-68 和 DUT-5）的玻璃形成，通常认为它们是不可熔化的。我们的工作为将多孔分子固体熔融淬火成玻璃开辟了一条途径。