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

Abstract Herein, we successfully prepared a conjugated polyfluorene (PFDPP) containing two different kinds of diketopyrrolopyrrole (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 (Ksv) and the limit of detection (LOD) of PFDPP were 2.30 × 105 M−1 and 1.31 × 10−6 M for Fe3+ and 1.05 × 105 M−1 and 1.81 × 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.