Slavney Adam H, Kim Hong Ki, Tao Songsheng, Liu Mengtan, Billinge Simon J L, Mason Jarad A
Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States.
Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, United States.
J Am Chem Soc. 2022 Jun 29;144(25):11064-11068. doi: 10.1021/jacs.2c02918. Epub 2022 Jun 14.
Glassy phases of framework materials feature unique and tunable properties that are advantageous for gas separation membranes, solid electrolytes, and phase-change memory applications. Here, we report a new guanidinium organosulfonate hydrogen-bonded organic framework (HOF) that melts and vitrifies below 100 °C. In this low-temperature regime, non-covalent interactions between guest molecules and the porous framework become a dominant contributor to the overall stability of the structure, resulting in guest-dependent melting, glass, and recrystallization transitions. Through simulations and X-ray scattering, we show that the local structures of the amorphous liquid and glass phases resemble those of the parent crystalline framework.
骨架材料的玻璃相具有独特且可调节的性质，这对气体分离膜、固体电解质和相变存储器应用十分有利。在此，我们报道了一种新型的胍基有机磺酸盐氢键有机骨架（HOF），其在100°C以下会熔化并玻璃化。在这个低温范围内，客体分子与多孔骨架之间的非共价相互作用成为结构整体稳定性的主要贡献因素，导致了依赖客体的熔化、玻璃化和重结晶转变。通过模拟和X射线散射，我们表明非晶态液体和玻璃相的局部结构与母体晶体骨架的结构相似。
