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

The selective sorption properties of light gases on CUK-1, a porous coordination solid made of cobalt (II) and pyridine-2,4-dicarboxylic acid, at cryogenic and room temperature, was presented. The results show that a large quantity of O₂ standard temperature and pressure is adsorbed onto CUK-1 at 87 K and the adsorption isotherm indicates that oxygen is adsorbed in pores. Carbon dioxide sorption at 196 K shows a reversible isotherm upto dehydration at 573 K, while fitting Brunauer-Emmett-Teller (BET) equation to the resulting isotherm of CO₂ gives an estimated surface area of 630 m₂g_-1. The results also show that the sorption of O ₂ at 196 K in CUK-1 dehydrated at 573 K reveals almost a reversible isotherm with an O₂ uptake of 58 mLg_-1 at 760 Torr.