Polysubstitution of dipyrrolonaphthyridinediones as a potent strategy towards strongly emitting fluorophores

Abstract

By leveraging the strongly Lewis acidic nature of BBr₃, we were able to control the bromination of dipyrrolonaphthyridinediones giving access to mono- to hexabrominated scaffolds, resulting in the formation of new π-expanded derivatives. Modifying specific core positions allowed us to achieve previously unattainable luminescence brightness in these systems, as well as a shift in their emission to the deep-red region.