Front Cover: Bis[1]benzothieno[1,4]thiaborins as a Platform for BODIPY Singlet Oxygen Photosensitizers (Chem. Eur. J. 36/2023)

Singlet oxygen is generated by the BODIPY photosensitizer, whose X-ray structure is shown in the central part of the picture. The structures in the left and right corners of the doors are those of bis(benzothienylo)[1,4]thiaborins—basic building blocks of BODIPY. The sensitization process requires white light, which is symbolized by a light bulb. Triplet oxygen enters through the red door, where it is excited to the singlet state, and leaves through the blue door. More information can be found in the Research Article by P. H. Marek-Urban, K. Durka, and co-workers (DOI: 10.1002/chem.202300680). Artwork by P.H.M.-U.