Mounfield William P, Walton Krista S
School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, GA 30332, United States.
J Colloid Interface Sci. 2015 Jun 1;447:33-9. doi: 10.1016/j.jcis.2015.01.027. Epub 2015 Jan 22.
This work reports the effect of using dimethylformamide (DMF) as the solvent for synthesizing MIL-53(Al). This well-known breathing MOF is typically prepared using hydrothermal methods. The two materials synthesized in DMF at 120°C and 220°C show significant deviations from the breathing behavior exhibited by the material synthesized hydrothermally. Powder X-ray diffraction confirmed that MIL-53(Al) synthesized in DMF at 120°C remains in the large-pore form under all conditions, while the other material synthesized at 220°C undergoes a more gradual breathing transition than is observed for MIL-53(Al) prepared by traditional methods. Solid-state NMR was employed to elucidate additional structural information and gain insight into the role synthesis solvent plays on breathing behavior. The CO2 and water adsorption of these large-pore stabilized materials were studied, and the differences in adsorption behavior compared to MIL-53(Al) prepared by traditional methods was discussed.
这项工作报道了使用二甲基甲酰胺（DMF）作为溶剂合成MIL-53（Al）的效果。这种著名的具有呼吸效应的金属有机框架材料通常采用水热法制备。在120°C和220°C下于DMF中合成的两种材料，与水热法合成的材料所表现出的呼吸行为有显著偏差。粉末X射线衍射证实，在120°C下于DMF中合成的MIL-53（Al）在所有条件下均保持大孔形式，而在220°C下合成的另一种材料经历的呼吸转变比传统方法制备的MIL-53（Al）更为渐进。采用固态核磁共振来阐明更多结构信息，并深入了解合成溶剂对呼吸行为的作用。研究了这些大孔稳定材料对二氧化碳和水的吸附情况，并讨论了与传统方法制备的MIL-53（Al）相比吸附行为的差异。
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