Metal–organic framework (MOF) glasses are a fascinating new class of materials, yet their prosperity has been impeded by the scarcity of known examples and limited vitrification methods. In the work described in this report, we applied synergistic stimuli of vapor hydration and thermal dehydration to introduce structural disorders in interpenetrated dia-net MOF, which facilitate the formation of stable super-cooled liquid and quenched glass. The material after stimulus has a glass transition temperature (T_g) of 560 K, far below the decomposition temperature of 695 K. When heated, the perturbed MOF enters a super-cooled liquid phase that is stable for a long period of time (>10⁴ s), across a broad temperature range (26 K), and has a large fragility index of 83. Quenching the super-cooled liquid gives rise to porous MOF glass with maintained framework connectivity, confirmed by EXAFS and PDF analysis. This method provides a fundamentally new route to obtain glassy materials from MOFs that cannot be melted without causing decomposition.

中文翻译：

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用于稳定过冷液体和淬火玻璃的金属-有机框架的协同激励

金属有机框架 (MOF) 玻璃是一类引人入胜的新型材料，但由于已知实例的稀缺和有限的玻璃化方法，阻碍了它们的发展。在本报告中描述的工作中，我们应用蒸汽水合和热脱水的协同刺激来在互穿的直径网 MOF 中引入结构紊乱，从而促进稳定的过冷液体和淬火玻璃的形成。刺激后材料的玻璃化转变温度（Tg ）_为560 K，远低于695 K的分解温度。受热时，受扰动的MOF进入长期稳定的过冷液相（> 10 ⁴s)，在很宽的温度范围内 (26 K)，并且具有 83 的大脆性指数。通过 EXAFS 和 PDF 分析证实，对过冷液体进行淬火会产生具有保持框架连接性的多孔 MOF 玻璃。这种方法提供了一种从 MOF 中获得玻璃材料的全新途径，这种材料不能在不引起分解的情况下熔化。