Wobbling and Hopping: Studying Dynamics of CO2 Adsorbed in Metal-Organic Frameworks via (17)O Solid-State NMR.
Wobbling and Hopping: Studying Dynamics of CO2 Adsorbed in Metal-Organic Frameworks via (17)O Solid-State NMR.
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DOI：
10.1021/jz501729d
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发表时间：
2014-09
期刊：
影响因子：
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通讯作者：
W. Wang;Bryan E. G. Lucier;V. Terskikh;W. Wang;Yining Huang
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文献类型：
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作者：
W. Wang;Bryan E. G. Lucier;V. Terskikh;W. Wang;Yining Huang
微孔固体内吸附气体动力学的知识对于设计更有效的气体捕集材料至关重要。我们以CPO-27-M(M=镁，锌)为例，证明了(17)O固态核磁共振(SSNMR)实验允许人们获得关于金属-有机骨架(MOF)中二氧化碳动力学的准确信息。从150到403K获得的变温(VT)(17)O SS核磁共振谱产生了定义二氧化碳运动的关键参数。CPO-27-Zn的VT(17)O SS核磁共振谱表明，金属-氧结合相对较弱，CO2动力学增强。(17)由于同时存在四极相互作用和化学屏蔽作用，O SS核磁共振是一种敏感的CO2动力学探针，并具有研究各种微孔材料中运动的潜力。
Knowledge of adsorbed gas dynamics within microporous solids is crucial for the design of more efficient gas capture materials. We demonstrate that (17)O solid-state NMR (SSNMR) experiments allow one to obtain accurate information on CO2 dynamics within metal-organic frameworks (MOFs), using CPO-27-M (M = Mg, Zn) as examples. Variable-temperature (VT) (17)O SSNMR spectra acquired from 150 to 403 K yield key parameters defining the CO2 motions. VT (17)O SSNMR spectra of CPO-27-Zn indicate relatively weaker metal-oxygen binding and increased CO2 dynamics. (17)O SSNMR is a sensitive probe of CO2 dynamics due to the presence of both the quadrupolar and chemical shielding interactions, and holds potential for the investigation of motions within a variety of microporous materials.