This work reports a novel chain-growth polymerization strategy that allows for constructing GNR heterojunction with N=9 armchair and chevron GNRs segments (9-AGNR/cGNR). The synthesis involves a controlled Suzuki–Miyaura catalyst-transfer polymerization (SCTP) between two bifunctional monomers, followed by the Scholl reaction of the obtained block copolymer (poly-M1/M2) with controlledMn (18 kDa) and narrowĐ (1.45). NMR and SEC analysis of poly-M1/M2confirm the successful block copolymerization. The solution-mediated cyclodehydrogenation of poly-M1/M2 toward 9-AGNR/cGNR is unambiguously validated by FT-IR, Raman, and UV/Vis spectroscopies. Moreover, we also demonstrate the on-surface formation of pristine 9-AGNR/cGNRfrom the unsubstituted copolymer precursor, which is unambiguously characterized by scanning tunneling microscopy (STM).

原文链接：https://onlinelibrary.wiley.com/doi/epdf/10.1002/anie.202310880