Highly selective carbon dioxide adsorption on exposed magnesium metals in a cross-linked organo-magnesium complex

Abstract

A cross-linked organo-magnesium complex (MTF–Mg) was synthesized and investigated for selective CO₂ adsorption over N₂ at 298 K. Remarkably high selectivity and reversibility were achieved with an isosteric heat of adsorption of 45.2 kJ mol⁻¹ for CO₂, consistent with the predicted DFT value of 37.3 kJ mol⁻¹. The CO₂ preferential adsorption arises from its strong interaction with the exposed magnesium atoms.