Constructing Diketopyrrolopyrrole-Based Fluorescent Porous Organic Polymer for Chromo Communication via Guest-to-Host Energy Transfer

To obtain solid scaffolds exhibiting brilliant solid state fluorescence and serving as an arena for chromo communication via host–guest energy transfer, a series of diketopyrrolopyrrole moieties with different modified bulky groups were coupled into the porous polymeric networks via Sonogashira coupling reaction. Variation of the bulky substitution groups rendered the tunability of porosity. With the improved porosity, it triggered the spatial isolation of the fluorophores and further enhanced the solid-state fluorescence of these polymers. More importantly, the brilliant nanopores can also serve to confine guest molecules to form a donor–acceptor system via energy transfer. After loading coumarin, outstanding energy transfer efficiency, was observed based on the calculation upon fluorescence decay measurements, spectral overlap function and the estimation of Föster radius. This study provided important insights of designing novel fluorescent POPs with efficient energy transfer flows.