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Graphene Nanoribbons Derived From Zigzag Edge-Encased Poly(para-2,9-dibenzo[bc,kl]coronenylene) Polymer Chains.

著者 Beyer D , Wang S , Pignedoli CA , Melidonie J , Yuan B , Li C , Wilhelm J , Ruffieux P , Berger R , Müllen K , Fasel R , Feng X
J Am Chem Soc.2019 Feb 07 ; ():.
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In this work, we demonstrate the bottom-up on-surface synthesis of poly(para-dibenzo[bc,kl]-coronenylene) (PPDBC), a zigzag edge-encased analog of poly(para-phenylene) (PPP), and its lateral fusion into zigzag edge-rich graphene nanoribbons (ZGNRs). Towards this end, we designed a dihalogenated di(meta-xylyl)anthracene monomer displaying strategic methyl groups at the substituted phenyl ring and investigated its applicability as precur-sor in the thermally induced surface-assisted polymerization and cyclodehydrogenation. The structure of the resulting zigzag edge-rich (70 %) polymer PPDBC was confirmed by scanning tunneling microscopy (STM) and non-contact atomic force microscopy (nc-AFM). Remarkably, by further thermal treatment at 450 °C two and three aligned PPDBC chains can be laterally fused into expanded, zigzag edged graphene nanoribbons (ZGNRs), with a ribbon width of nine (N = 9) up to seventeen (N = 17) carbon atoms wide. Moreover, the resultant ZGNRs exhibit a high ratio of zigzag (67 %) vs. armchair (25 %) edge topologies featuring electronic band gaps as low as 0.15 eV according to DFT calculations.
PMID: 30731042 [PubMed - as supplied by publisher]
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