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首页> 外文期刊>Langmuir: The ACS Journal of Surfaces and Colloids >CO Guest Interactions in SDB-Based Metal-Organic Frameworks: A Solid-State Nuclear Magnetic Resonance Investigation
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CO Guest Interactions in SDB-Based Metal-Organic Frameworks: A Solid-State Nuclear Magnetic Resonance Investigation

机译：基于SDB的金属有机框架的CO访客互动：固态核磁共振调查

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Metal-organic frameworks (MOFs) are promising materials for greener carbon monoxide (CO) capture and separation processes. SDB-based (SDB = 4,4-sulfonyldibenzoate) MOFs are particularly attractive due to their remarkable gas adsorption capacity under humid conditions. However, to the best of our knowledge, their CO adsorption abilities have yet to be investigated. In this report, CO-loaded PbSDB and CdSDB were characterized using variable-temperature (VT) C-13 solid-state nuclear magnetic resonance (SSNMR) spectroscopy. These MOFs readily captured CO, with the adsorbed CO exhibiting dynamics as indicated by the temperature-dependent changes in the SSNMR spectra. Spectral simulations revealed that the CO simultaneously undergoes a localized wobbling about the adsorption site and a nonlocalized hopping between adjacent adsorption sites. The wobbling and hopping angles were also found to be temperature-dependent. From the appearance of the VT spectra and the extracted motional data, the CO adsorption mechanism was concluded to be analogous to that of CO2. To gain a better understanding on the gas adsorption properties of these MOFs and their CO capture abilities, we subsequently compared the motional data to those reported for CO2 in SDB-based MOFs and CO in MOF-74, respectively. A significant contrast in adsorption strength was observed in both cases because of the different physical properties of the guests (i.e., CO vs CO2) and the MOF frameworks (i.e., SDB-based MOFs vs MOFs with open metal sites). Our results demonstrate that SSNMR spectroscopy can be employed to probe variations in binding behavior.
机译：金属 - 有机框架（MOFS）是更绿色一氧化碳（CO）捕获和分离过程的有希望的材料。基于SDB的（SDB = 4,4-磺胺LigisHoate）MOF由于其在潮湿条件下的卓越气体吸附容量而特别有吸引力。然而，据我们所知，他们的共同吸附能力尚未被调查。在本报告中，使用可变温度（VT）C-13固态核磁共振（SSNMR）光谱来表征加载的PBSDB和CDSDB。这些MOF可以容易地捕获CO，具有吸附的CO表现出动态，如SSNMR光谱的温度依赖性变化所示。光谱仿真显示，CO同时经历关于吸附部位的局部摆动和相邻吸附位点之间的非韵律跳跃。也发现摆动和跳跃角度是温度依赖性的。从VT光谱和提取的运动数据的出现，结论是与CO2的共同吸附机理。为了更好地了解这些MOF的气体吸附性质及其Co捕获能力，我们随后将动态数据与SDB基础MOF和CO中的CO2报道的那些进行了比较。两种情况下观察到吸附强度的显着对比，因为客人的物理性质（即Co VS CO2）和MOF框架（即，基于SDB的MOF与具有开放金属位点的MOF）的物理性质不同。我们的结果表明，SSNMR光谱可以用于探测结合行为的变化。

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