9-(2,6-Dimethylphenyl)-10-methylacridinium perchlorate is a specialty acridinium salt primarily employed as a photoredox catalyst in organic synthesis. It enables efficient C-H bond activation, oxidation reactions, and other selective transformations under visible light. Its redox and fluorescent properties support applications in electrochemistry as an electron transfer agent and in materials science for developing photoactive and electroactive materials. Additionally, its strong fluorescence makes it useful as a probe in biological imaging to visualize cellular structures, and in photodynamic therapy as a photosensitizer for targeted cancer cell destruction upon light activation.