Fig. 1
From: Control over multiple molecular states with directional changes driven by molecular recognition
Crystal structures and graphical summary of the underlying equilibria. a Single crystal X-ray structures of bispyridine-substituted calix[4]pyrrole 1. b Single crystal structure of trifluoroacetate-bound 1. c Schematic representation of single crystal X-ray structures of the six different equilibrium states that can be accessed by judicious addition of ionic guests
