On‐Surface Synthesis and Characterization of Triply Fused Porphyrin–Graphene Nanoribbon Hybrids. Issue 3 (4th December 2019)

• Record Type: Journal Article
• Authors: Mateo, Luis M.; Sun, Qiang; Liu, Shi‐Xia; Bergkamp, Jesse J.; Eimre, Kristjan; Pignedoli, Carlo A.; Ruffieux, Pascal; Decurtins, Silvio; Bottari, Giovanni; Fasel, Roman; Torres, Tomas
• Is Part Of: Angewandte Chemie international edition. Volume 59:Issue 3(2020)
• Page Start: 1334
• Page End: 1339
• Publication Date: 2019-12-04
• Subjects: graphene nanoribbon (GNR) -- hybrid nanostructures -- on-surface synthesis -- porphyrin -- Ullmann-type coupling; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201913024
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: 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. Abstract : Made on the surface : A porphyrin–graphene nanoribbon hybrid is prepared by selective on‐surface synthesis. The atomically precise structure of the hybrid is characterized by bond‐resolved scanning tunneling microscopy and noncontact atomic force microscopy. Scanning tunneling spectroscopy (STS), in combination with DFT calculations, reveals a low electronic gap of 0.4 eV.