Synthesis and Characterization of Near-Infrared Emissive BODIPY-Based Conjugated Polymers

Three novel BODIPY-based conjugated polymers could be synthesized via palladium-catalyzed Sonogashira coupling reaction. Compared with BODIPY model derivatives, the polymers can emit in the range from deep-red to near-infrared region with emission spectral maxima at lambda = 640-660 nm and exhibit moderate fluorescent quantum yield from 0.23 to 0.26. Density functional theory (DFT) calculations are performed on three polymers repeat units, and HOMO and LUMO energy levels of the conjugated polymers are estimated.