Outside Front Cover: Volume 5 Issue 5

Outside front cover image: This study represents the reversible radical process in the boroxine-linked covalent organic framework (COF, CityU-3). The visual transition from red to black molecules highlights the response of CityU-3 to external stimuli (BF3·Et2O treatment), leading to radical formation and subsequent reversal. The revisable radical formation suggests the material's potential applications in organic spin-based devices. This innovative work opens up new avenues for the development of spin-based COF materials. (https://onlinelibrary.wiley.com/doi/full/10.1002/smm2.1265)