Multi-stimuli responsive fluorescence chemosensor based on diketopyrrolopyrrole-based conjugated polyfluorene

Herein, we successfully prepared a conjugated polyfluorene (PFDPP) containing two different kinds of diketo-pyrrolopyrrole (DPP) derivatives (M1 and M2) through Suzuki polymerization. The chemical sensing and optical properties of PFDPP were investigated and discussed in detail in the presence of different cations and anions. The Photoluminescence (PL) titrations results demonstrated that the Stern-Volmer constants (K-sv) and the limit of detection (LOD) of PFDPP were 2.30 x 10(5) M-1 and 1.31 x 10(-6) M for Fe3+ and 1.05 x 10(5) M-1 and 1.81 x 10(-6) M for F-. In addition, we observed that PFDPP solution showed complete emission quenching when pH increased from 11 to 13 owing to the protonation for DPP structures. Therefore, we expect the PFDPP material could be used as a good candidate for chemosensory and other environmental applications.

Automated summary

In this study, a conjugated polyfluorene (PFDPP) containing two different diketo-pyrrolopyrrole (DPP) derivatives was successfully synthesized through Suzuki polymerization. The chemical sensing and optical properties of PFDPP were investigated, showing high sensitivity to Fe3+ and F- ions, and complete emission quenching at higher pH values due to protonation of DPP structures. The results suggest that PFDPP could be a promising material for chemosensory and environmental applications.