AI Article Synopsis
- Nature has evolved various biological systems with switchable recognition functions, like biological membranes that adjust ion selectivity based on external stimuli.
- A significant challenge in chemistry is creating artificial systems that can switch recognition of specific guests in response to changing environmental conditions.
- Researchers developed a temperature-responsive porous crystal that selectively adsorbs carbon monoxide (CO) at low temperatures and methane (CH) at higher temperatures, achieving high separation factors due to its unique diffusion-regulating mechanism.
Article Abstract
Over the long history of evolution, nature has developed a variety of biological systems with switchable recognition functions, such as the ion transmissibility of biological membranes, which can switch their ion selectivities in response to diverse stimuli. However, developing a method in an artificial host-guest system for switchable recognition of specific guests upon the change of external stimuli is a fundamental challenge in chemistry because the order in the host-guest affinity of a given system hardly varies along with environmental conditions. Herein, we report temperature-responsive recognition of two similar gaseous guests, CO and CH, with selectivities switched by temperature change by a diffusion-regulatory mechanism, which is realized by a dynamic porous crystal featuring ultrasmall pore apertures with flip-flop locally-motive organic moiety. The dynamic local motion regulates the diffusion process of CO and CH and amplifies their rate differences, allowing the crystal to selectively adsorb CO at low temperatures and CH at high temperatures with separation factors of 498 (CO/CH) and 181 (CH/CO), respectively.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10761840 | PMC |
| http://dx.doi.org/10.1038/s41467-023-44424-3 | DOI Listing |
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