Guest-Induced Structural Transformations in a Porous Halogen-Bonded Framework.

Structural evidence obtained from in situ X-ray diffraction shows that halogen bonding is responsible for the formation of a dynamic porous molecular solid. This material is surprisingly robust and undergoes reversible switching of its pore volume by activation or by exposure to a series of gases of different sizes and shapes. Volumetric gas sorption and pressure-gradient differential scanning calorimetry (P-DSC) data provide further mechanistic insight into the breathing behavior.