Phenoxazine and diketopyrrolopyrrole based donor-acceptor conjugated polymers: synthesis and optical properties

While numerous phenoxazine-based small molecules developed for organic electronic devices, very limited attention has been received on synthesized conjugated polymers containing this phenoxazine. Herein, we designed and two new low-bandgap donor−acceptor copolymers based phenoxazine with different side chains diketopyrrolopyrrole by Pd-catalyzed direct (hetero)arylation polycondensation using a Pd(OAc)2 catalyst PCy3.HBF4 ligand. The effects of chain branched alkyl benzoyl the thermal, optical properties have investigated. Both good yield 85%, high molecular weight up to 41500 g/mol, low dispersity index 1.91, excellent solubility in common solvents, broad absorption spectrum range 500-900 nm bandgaps as 1.40 eV. All these possess thermal stability decomposition temperatures over 350 oC no obvious transitions.