期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 116, 期 24, 页码 13307-13312出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp303907p
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资金
- National Science Foundation [CHE-0956006, DMR1101934]
- Molecularly Engineered Energy Materials, an Energy Frontier Research Center
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001342]
- National Research Foundation of Korea [R31-2012-000-10055-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [0956006] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1101934] Funding Source: National Science Foundation
NMR relaxation studies and spectroscopic measurements of zeolitic imidazolate framework-8 (ZIF-8) are reported. The dominant nuclear spin-lattice relaxation (T-1) mechanism for ZIF-8 in air arises from atmospheric paramagnetic molecular oxygen. The C-13 T-1 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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