Inside Back Cover: Reversible Luminescent Switching in an Organic Cocrystal: Multi‐Stimuli‐Induced Crystal‐to‐Crystal Phase Transformation (Angew. Chem. Int. Ed. 35/2020)

A crystal-to-crystal phase transformation of organic cocrystals in response to multiple external stimuli, such as solvent vapor and heating, accompanied by reversible luminescence switching is described by B. Xu and co-workers in their Communication on page 15098. The results indicate that the luminescence switching originates from the unique molecular rearrangement of a hydrogen/halogen-bond-directed stack into a π–π-interaction-directed stack in response to an external stimulus.