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The authors of this paper report that a crystal engineering or reticular chemistry strategy that controls pore functionality and size in a series of metal-organic materials (MOMs) with coordinately saturated metal centres and periodically arrayed hexafluorosilicate (SiF62−) anions enables a 'sweet spot' of kinetics and thermodynamics that offers high volumetric uptake at low CO2 partial pressure (less than 0.15 bar). Most importantly, such MOMs offer an unprecedented CO2 sorption selectivity over N2, H2 and CH4, even in the presence of moisture. [Source: Nature]
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