Mapping Solvation Environments in Porous Metal-Organic Frameworks with Infrared Chemical Imaging
Mapping Solvation Environments in Porous Metal-Organic Frameworks with Infrared Chemical Imaging
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DOI：
10.1021/acs.jpclett.7b02104
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发表时间：
2017-11-02
影响因子：
5.7
通讯作者：
Bhargava, Rohit
中科院分区：
文献类型：
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作者：
Ghosh, Ayanjeet;Mukherjee, Prabuddha;Bhargava, Rohit
我们在这里报告了第一个使用红外成像的金属有机框架（MOF）Cu-3（BTC）（2）中溶剂环境的介观表征。观察到对应于与Cu（II）（金属）离子结合的羧酸盐的两种特征群体的MOF结构，这反映了双核铜桨轮中具有轴向溶剂的规则溶剂化的MOF结构和缺乏轴向溶剂配位的非溶剂化缺陷模式。红外成像还显示了溶剂定位和MOF内溶剂化群体的空间分布之间的强相关性。这是一个至关重要的结果，因为任何残留的溶剂分子吸附在MOFs内部都会使它们的效率降低。我们提出快速红外成像作为一种潜在的表征技术，可以测量吸附质和缺陷分布的MOFs。
We report here the first mesoscale characterization of solvent environments in the metal organic framework (MOF) Cu-3(BTC)(2) using infrared imaging. Two characteristic populations of the MOF structures corresponding to the carboxylate binding to the Cu(II) (metal) ions were observed, which reflect a regular solvated MOF structure with axial solvents in the binuclear copper paddlewheel and an unsolvated defect mode that lacks axial solvent coordination. Infrared imaging also shows strong correlation between solvent localization and the spatial distribution of the solvated population within the MOF. This is a vital result as any remnant solvent molecules adsorbed inside of MOFs can render them less effective. We propose fast IR imaging as a potential characterization technique that can measure adsorbate and defect distributions in MOFs.