A macrocyclic dibenzocoronenetetracarboxdiimide containing two benzo‐21‐crown‐7 groups has been synthesized. It shows liquid‐crystalline behavior and selectively binds Pb2+ or K+ to form 1:2 complexes in solution. The complexation leads to a significant increase of fluorescence; the surface organization of discotic columnar structures, in the solid‐state, can be controlled by selective ion binding