(Mechano)synthesis of azomethine- and terpyridine-linked diketopyrrolopyrrole-based polymers

Three efficient synthetic approaches towards new azomethine- and terpyridine-containing 2,5-dihydropyrrolo[3,4-c]pyrrole-1,4-dione (diketopyrrolopyrrole, DPP) based polymers, such as P1 P2, are reported. The first approach involves the Pd-catalyzed synthesis via two- or three-component Suzuki Stille cross-coupling reaction in solution. second under ball-milling conditions. And, finally, third Pd-free condensation newly obtained polymers exhibited absorbance around 700 nm emission 900 nm, and, thus, these considered to be NIR-fluorophores.