Fig. 2: Crystal structures of cages with different counterions.

Side view and top view of a 3·6Cl b 3·6Br c 3·6I and d 3·6PF₆. Hydrogen bonds and anion···π interactions are shown with a cyan dashed line. Color code: C, grey; H, white; N, blue; Cl, green; Br, brown; I, purple; P, orange; F, olive.