Gas-sorption selectivity of CUK-1: A porous coordination solid made of cobalt(II) and pyridine-2,4-dicarboxylic acid

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 O-2 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.