Fig. 5
From: Control over multiple molecular states with directional changes driven by molecular recognition
Crystal structures of the molecular capsules. a 12 ⊃ 2•Cs+, which lacks a bridging cation (H+ or Ag+) between the pyridine arms. b 12 ⊃ 2, wherein the pyridine moieties are bridged by Ag+ cations. c 12 ⊃ 2 and d 12 ⊃ TFA2, wherein the pyridine arms are connected via a bridging proton as inferred from the metric parameters and charge considerations
