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On‐Surface Synthesis and Characterization of Triply Fused Porphyrin–Graphene Nanoribbon Hybrids
Author(s) -
Mateo Luis M.,
Sun Qiang,
Liu ShiXia,
Bergkamp Jesse J.,
Eimre Kristjan,
Pignedoli Carlo A.,
Ruffieux Pascal,
Decurtins Silvio,
Bottari Giovanni,
Fasel Roman,
Torres Tomas
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201913024
Subject(s) - scanning tunneling microscope , graphene , porphyrin , graphene nanoribbons , nanotechnology , heteroatom , materials science , context (archaeology) , scanning tunneling spectroscopy , covalent bond , nanostructure , hybrid material , molecular electronics , electronic structure , chemistry , molecule , photochemistry , computational chemistry , organic chemistry , ring (chemistry) , paleontology , biology
On‐surface synthesis offers a versatile approach to prepare novel carbon‐based nanostructures that cannot be obtained by conventional solution chemistry. Graphene nanoribbons (GNRs) have potential for a variety of applications. A key issue for their application in molecular electronics is in the fine‐tuning of their electronic properties through structural modifications, such as heteroatom doping or the incorporation of non‐benzenoid rings. In this context, the covalent fusion of GNRs and porphyrins (Pors) is a highly appealing strategy. Herein we present the selective on‐surface synthesis of a Por–GNR hybrid, which consists of two Pors connected by a short GNR segment. The atomically precise structure of the Por–GNR hybrid has been characterized by bond‐resolved scanning tunneling microscopy (STM) and noncontact atomic force microscopy (nc‐AFM). The electronic properties have been investigated by scanning tunneling spectroscopy (STS), in combination with DFT calculations, which reveals a low electronic gap of 0.4 eV.