As a size-selective molecular sieve, the coordination polymer formed from cobalt and pyridine-2,4-dicarboxylic acid (CUK-1, see figure) shows unprecedented selectivity for O2 and preferential selectivity for CO2 over CH4. The present sorption results encourage the development of new adsorbent materials that may find use in the production of high-purity gas products. This work demonstrates that CUK-1 can be utilized, for the first time, in the separation of light gases via gas chromatography.
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