Engineering new defective phases of UiO family metal-organic frameworks with water
Engineering new defective phases of UiO family metal-organic frameworks with water
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DOI：
10.1039/c8ta10682g
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发表时间：
2019-04-07
影响因子：
11.9
通讯作者：
Grey, Clare P.
中科院分区：
文献类型：
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作者：
Firth, Francesca C. N.;Cliffe, Matthew J.;Grey, Clare P.
由于缺陷对金属有机骨架材料的力学性能和催化性能有着重要的影响，因此对缺陷的综合控制对于调节金属有机骨架材料的性能至关重要。先前的工作已经表明，合成温度以及调节酸的特性和浓度是确定MOF的UiO家族中缺陷的性质和分布的关键因素。在本文中，我们证明了在合成UiO族MOF中反应混合物中的水量是同样重要的因素，因为它控制了UiO-67（Hf）和UiO-66（Hf）（F4 BDC）形成的相。我们使用这种新的理解的重要性，水开发一种新的路线，以稳定的缺陷有序hcp UiO-66（Hf）相，证明了这种方法的缺陷工程的有效性，在合理设计的MOFs。这项研究提供的见解开辟了利用缺陷产生其他MOF（包括纳米片）的新相和维度的可能性，用于各种应用，如基于MOF的膜。
As defects significantly affect the properties of metal-organic frameworks (MOFs)from changing their mechanical properties to enhancing their catalytic abilityobtaining synthetic control over defects is essential to tuning the effects on the properties of the MOF. Previous work has shown that synthesis temperature and the identity and concentration of modulating acid are critical factors in determining the nature and distribution of defects in the UiO family of MOFs. In this paper we demonstrate that the amount of water in the reaction mixture in the synthesis of UiO family MOFs is an equally important factor, as it controls the phase which forms for both UiO-67(Hf) and UiO-66(Hf) (F4BDC). We use this new understanding of the importance of water to develop a new route to the stable defect-ordered hcp UiO-66(Hf) phase, demonstrating the effectiveness of this method of defect-engineering in the rational design of MOFs. The insights provided by this investigation open up the possibility of harnessing defects to produce new phases and dimensionalities of other MOFs, including nanosheets, for a variety of applications such as MOF-based membranes.