Crystallizing Atomic Xenon in a Flexible MOF to Probe and Understand Its Temperature-Dependent Breathing Behavior and Unusual Gas Adsorption Phenomenon
- Shenzhen Polytechnic (China); Rutgers Univ., Piscataway, NJ (United States)
- Diamond Light Source Ltd., Didcot (United Kingdom)
- Micromeritics Instrument Corporation, Norcross, GA (United States)
- Wake Forest Univ., Winston-Salem, NC (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
- Univ. of Texas at Dallas, Richardson, TX (United States)
- Shenzhen Polytechnic (China)
- Rutgers Univ., Piscataway, NJ (United States)
- Rutgers Univ., Piscataway, NJ (United States); Shenzhen Polytechnic (China)
Flexible metal–organic frameworks (MOFs) hold great promise as smart materials for specific applications such as gas separation. These materials undergo interesting structural changes in response to guest molecules, which is often associated with unique adsorption behavior not possible for rigid MOFs. Understanding the dynamic behavior of flexible MOFs is crucial yet challenging as it involves weak host–guest interactions and subtle structural transformation not only at the atomic/molecular level but also in a nonsteady state. We report here an in-depth study on the adsorbate- and temperature-dependent adsorption in a flexible MOF by crystallizing atomic gases into its pores. Mn(ina)2 shows an interesting temperature-dependent response toward noble gases. Its nonmonotonic, temperature-dependent adsorption profile results in an uptake maximum at a temperature threshold, a phenomenon that is unusual. Full characterization of Xe-loaded MOF structures is performed by in situ single-crystal and synchrotron X-ray diffraction, IR spectroscopy, and molecular modeling. The X-ray diffraction analysis offers a detailed explanation into the dynamic structural transformation and provides a convincing rationalization of the unique adsorption behavior at the molecular scale. The guest and temperature dependence of the structural breathing gives rise to an intriguing reverse of Xe/Kr adsorption selectivity as a function of temperature. The presented work may provide further understanding of the adsorption behavior of noble gases in flexible MOF structures.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States); Rutgers Univ., Piscataway, NJ (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC); Guangdong Natural Science Foundation; Scientific and Technical Innovation Council of Shenzhen; USDOE Office of Science (SC), Biological and Environmental Research (BER)
- Grant/Contract Number:
- SC0012704; FG02- 08ER46491; SC0019902; 21901166; 2019A1515010692; JCYJ20190809145615620
- OSTI ID:
- 1749889
- Alternate ID(s):
- OSTI ID: 1787516
- Report Number(s):
- BNL-220745-2020-JAAM
- Journal Information:
- Journal of the American Chemical Society, Vol. 142, Issue 47; ISSN 0002-7863
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
A flexible metal–organic framework: Guest molecules controlled dynamic gas adsorption
Engineering Structural Dynamics of Zirconium Metal–Organic Frameworks Based on Natural C4 Linkers