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a) Porous imine cage CC3 synthesized from 1,3,5-triformylbenzene and (R,R)-1,2-diaminocyclohexane by a condensation reaction. b) PIM-1 is synthesized from 5,5′,6,6′-tetrahydroxy-3,3,3′,3′-tetramethyl-1,1′-spirobisindane and 1,4-dicyanotetrafluorobenzene by a step polymerization involving a double aromatic nucleophilic substitution. c) SEM image of a cross-section of a PIM-1/CC3 composite membrane (weight ratio 10:2).
