沸石咪唑盐骨架
咪唑酯
取代基
顺磁性
部分
放松(心理学)
结晶学
化学
金属有机骨架
吸附
物理化学
无机化学
立体化学
凝聚态物理
物理
心理学
社会心理学
作者
William Morris,Caitlin J. Stevens,Robert E. Taylor,Cecil Dybowski,Omar M. Yaghi,Miguel A. Garcı́a-Garibay
摘要
NMR relaxation studies and spectroscopic measurements of zeolitic imidazolate framework-8 (ZIF-8) are reported. The dominant nuclear spin–lattice relaxation (T1) mechanism for ZIF-8 in air arises from atmospheric paramagnetic molecular oxygen. The 13C T1 measurements indicate that the oxygen interacts primarily with the imidazolate ring rather than the methyl substituent. Similar relaxation behavior was also observed in a ZIF with an unsubstituted ring, ZIF-4. Single-crystal X-ray diffraction was used to provide data for the study of the thermal ellipsoids of ZIF-8 at variable temperatures from 100 to 298 K, which further confirmed the rigid nature of this ZIF framework. These results highlight a rigid ZIF framework and are in contrast with dynamic metal–organic frameworks based on benzenedicarboxylate linking groups, for which the relaxation reflects the dynamics of the benzenedicarboxylate moiety.
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