Multi‐Resonant Thermally Activated Delayed Fluorescent (MR‐TADF) Compounds as Photocatalysts**

Abstract

Abstract Donor‐acceptor (D−A) thermally activated delayed fluorescent (TADF) compounds, such as 4CzIPN , have become a widely used sub‐class of organic photocatalysts for a plethora of photocatalytic reactions. Multi‐resonant TADF (MR‐TADF) compounds, a subclass of TADF emitters that are rigid nanographene derivatives, such as DiKTa and Mes 3 DiKTa , have to date not been explored as photocatalysts. In this study both DiKTa and Mes 3 DiKTa were found to give comparable or better product yield than 4CzIPN in a range of photocatalytic processes that rely upon reductive quenching, oxidative quenching, energy transfer and dual photocatalytic processes. In a model oxidative quench process, DiKTa and Mes 3 DiKTa gave increased reaction rates in comparison to 4CzIPN , with DiKTa being of particular interest due to the lower material cost (£0.94/mmol) compared to that of 4CzIPN (£3.26/mmol). These results suggest that DiKTa and Mes 3 DiKTa would be excellent additions to any chemist's collection of photocatalysts.