Pressure-Induced Amorphization and Porosity Modification in a Metal-Organic Framework
Pressure-Induced Amorphization and Porosity Modification in a Metal-Organic Framework
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DOI：
10.1021/ja908415z
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发表时间：
2009-12-09
影响因子：
15
通讯作者：
Chupas, Peter J.
中科院分区：
文献类型：
--
作者：
Chapman, Karena W.;Halder, Gregory J.;Chupas, Peter J.
利用原位粉末X射线衍射结合压力处理样品的吸附测量，研究了适度的工业可达压力（0 - 1.2 GPa）对沸石咪唑酯骨架Zn（2-甲基咪唑）2，ZIF-8的结构和孔隙率的影响。该框架是高度可压缩的，体积模量（K= −V P/V）为6.52（35）GPa，是迄今为止记录的最可压缩的金属有机框架（MOF）。该框架经历了不可逆的压力诱导的非晶化后压缩超过0.34 GPa。压力非晶化的ZIF-8仍然是多孔的，尽管与原始材料相比，吸附特性明显改变。因此，压力可以提供一种新的途径来系统地改变MOFs的吸附行为和其他功能特性，这是一种非传统的合成后修饰形式。重要的是，MOF的压力改性在比其他多孔材料（例如，沸石），因此易于规模化和工业上相关。
The impact of modest, industrially accessible pressures (0−1.2 GPa) on the structure and porosity of the zeolitic imidazolate framework Zn(2-methylimidazole)2, ZIF-8, was investigated usingin situpowder X-ray diffraction in combination with sorption measurements for pressure-treated samples. The framework is highly compressible, with a bulk modulus (K= −V ∂P/∂V) of 6.52(35) GPa, the most compressible metal−organic framework (MOF) documented to date. The framework undergoes an irreversible pressure-induced amorphization following compression beyond 0.34 GPa. The pressure-amorphized ZIF-8 remains porous, although the sorption characteristics are distinctly altered compared to the pristine material. As such, pressure can provide a new route to systematically modify the sorption behavior and other functional properties of MOFs, a nontraditional form of postsynthetic modification. Importantly, pressure modification of MOFs is effective at lower pressures than in other porous materials (e.g., zeolites) and, as such, is easily scalable and industrially relevant.