EAGER:Probing Oxygen Selectivity in a Flexible Metal-Organic Framework Using In Situ Spectroscopy

宾夕法尼亚州立大学拟议的工作旨在设计一种金属有机骨架(MOF)，它在接近环境温度时对氮气具有氧选择性。这两项联合研究将评估使用气体选择性结构转化作为气体分离手段的可行性，重点是开发一种在近环境温度下保持氧气选择性的材料。氧、氮和空气与氧选择性MOF的相互作用将使用原位FTIR和拉曼光谱以及气体扩散率和吸附测量相结合的方法进行研究。光谱学研究的目的将是了解哪些特定的气体-基质化学相互作用导致延长的感应期，以推迟柔性框架的打开。扩散率和吸附测量将阐明二次成分是如何影响这一点的，二次成分在打开结构的亲和力方面存在巨大差异。发展对导致快速打开的特定气体-表面相互作用的化学理解将使未来的材料设计纳入化学特性。

Lueking155119Penn StateThe proposed work seeks to design a metal organic framework (MOF) that is oxygen-selective over nitrogen at near ambient temperatures. The combined studies will assess the feasibility of using a gas-selective, structural transformation as a means for separations of gases, with a specific focus on developing a material that retains oxygen selectivity at near-ambient temperatures. Oxygen, nitrogen, and air interaction with the oxygen-selective MOF will be investigated using a combination of in situ FTIR and Raman spectroscopy, as well as gas diffusivity and adsorption measurements. The spectroscopy studies will aim to understand which specific gas-substrate chemical interactions lead to an extended induction period to delay opening of the flexible framework. The diffusivity and adsorption measurements will elucidate how this is influenced by a secondary component that drastically differs in affinity to open the structure. Developing a chemical understanding of the specific gas-surface interaction that leads to rapid opening will enable the incorporation of chemical specificity into future material design.