Racemic Porous Organic Cage Crystal with Selective Gas Adsorption Behaviors

Abstract A mixture containing the reactions solution between 3,3′′,5,5′′‐tetraformyl‐4,4′′‐[1,1′:4′,1′′‐terphenyl]diol (TTD) and two enantiomers of cyclohexanediamine, respectively, affords porous racemic molecular crystal ( 1 ). Two kinds of homochiral [3+6] porous organic cage molecules 1 have been clearly disclosed by single crystal X‐ray diffraction analysis, forming one‐dimensional porous supramolecular channels with the narrowest size of 3.5 Å. The intercrossing channels of 1 enable the permanent porosity as well as the selective gas adsorption of acetylene and carbon dioxide over methane.