Chem. Sci., 2025, Accepted Manuscript DOI: 10.1039/D5SC02879E, Edge Article Jevon Marsh, Lina Hacker, Sophie Alice Twigger, Jake Vickery, Shitong Huang, Claudia Almuzara Romero, Aaron Langston, Ismael Perez, Rebecca A Musgrave, Ester M Hammond, Adam Charles Sedgwick We report the synthesis and characterisation of a series of fluorogenic Pt(IV) complexes - CarboBlue, OxaliBlue and CisBlue. These Pt(IV) complexes were identified as photoactive, oxidising biomolecules under light irradation...