Journal
SCIENCE
Volume 363, Issue 6425, Pages 387-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aar6833
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Funding
- KAKENHI from the Japan Society for the Promotion of Science (JSPS) [JP25000007, JP18H05262]
- JSPS [JP16K17959, JP18H02072]
- ACCEL program of Japan Science and Technology Agency (JST) [JPMJAC1302]
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Design of the gas-diffusion process in a porous material is challenging because a contracted pore aperture is a prerequisite, whereas the channel traffic of guest molecules is regulated by the flexible and dynamic motions of nanochannels. Here, we present the rational design of a diffusion-regulatory system in a porous coordination polymer (PCP) in which flip-flop molecular motions within the framework structure provide kinetic gate functions that enable efficient gas separation and storage. The PCP shows substantial temperature-responsive adsorption in which the adsorbate molecules are differentiated by each gate-admission temperature, facilitating kinetics-based gas separations of oxygen/argon and ethylene/ethane with high selectivities of -350 and -75, respectively. Additionally, we demonstrate the long-lasting physical encapsulation of ethylene at ambient conditions, owing to strongly impeded diffusion in distinctive nanochannels.
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