Conjugated polymers have attracted much interest in industrial and academic fields due to their electrical and optoelectronic properties. Most of Conjugated Polymer have been synthesized via metal-catalyzed reactions in homogeneous system such as Pd-catalyzed Suzuki, Stille, Heck reactions, Ni-catalyzed Negishi, Kumada reactions, Ru-catalyzed olefin metathesis reactions (ROMP, ADMET), and Cu-catalyzed Sonogashira reaction. However, these homogeneous systems are mostly limited in that catalysts always remain within the polymer as metal and ligands after the reaction. These residual catalysts could reduce the electrical performance of Conjugated Polymer because those residual catalysts could act as a trap site of a hole or an electron.
We report on the utilization of Pd-Fe3O4 heterodimer nanocrystals as a magnetically recyclable and effective catalyst for the repetitive synthesis of CP via Suzuki cross-coupling reactions. After optimization of various reaction conditions of the polymerization, it was found that Pd-Fe3O4 heterodimer nanocrystal exhibit good catalytic activity for the synthesis of CP’s, can minimize the Pd content in the product CP, was magnetically recoverable through external magnet, and finally was reusable for the polymerization eleven times.