Wang, Shiyong; Nishiuchi, Tomohiko; Pignedoli, Carlo A; Yao, Xuelin; Di Giovannantonio, Marco; Zhao, Yan; Narita, Akimitsu; Feng, Xinliang; Müllen, Klaus; Ruffieux, Pascal; Fasel, Roman (2022). Steering on-surface reactions through molecular steric hindrance and molecule-substrate van der Waals interactions. Quantum frontiers, 1(1), p. 23. Springer 10.1007/s44214-022-00023-9
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UNLABELLED
On-surface synthesis is a rapidly developing field involving chemical reactions on well-defined solid surfaces to access synthesis of low-dimensional organic nanostructures which cannot be achieved via traditional solution chemistry. On-surface reactions critically depend on a high degree of chemoselectivity in order to achieve an optimum balance between target structure and possible side products. Here, we demonstrate synthesis of graphene nanoribbons with a large unit cell based on steric hindrance-induced complete chemoselectivity as revealed by scanning probe microscopy measurements and density functional theory calculations. Our results disclose that combined molecule-substrate van der Waals interactions and intermolecular steric hindrance promote a selective aryl-aryl coupling, giving rise to high-quality uniform graphene nanostructures. The established coupling strategy has been used to synthesize two types of graphene nanoribbons with different edge topologies inducing a pronounced variation of the electronic energy gaps. The demonstrated chemoselectivity is representative for n-anthryl precursor molecules and may be further exploited to synthesize graphene nanoribbons with novel electronic, topological and magnetic properties with implications for electronic and spintronic applications.
SUPPLEMENTARY INFORMATION
The online version contains supplementary material available at 10.1007/s44214-022-00023-9.
Item Type: |
Journal Article (Original Article) |
|---|---|
Division/Institute: |
08 Faculty of Science > Department of Chemistry, Biochemistry and Pharmaceutical Sciences (DCBP) |
UniBE Contributor: |
Fasel, Roman |
Subjects: |
500 Science > 570 Life sciences; biology 500 Science > 540 Chemistry |
ISSN: |
2731-6106 |
Publisher: |
Springer |
Language: |
English |
Submitter: |
Pubmed Import |
Date Deposited: |
10 Jan 2023 06:23 |
Last Modified: |
10 Jan 2023 23:23 |
Publisher DOI: |
10.1007/s44214-022-00023-9 |
PubMed ID: |
36619715 |
Uncontrolled Keywords: |
Atomic force microscopy Chemoselectivity Graphene nanoribbons On-surface synthesis Scanning tunneling spectroscopy |
BORIS DOI: |
10.48350/177122 |
URI: |
https://boris.unibe.ch/id/eprint/177122 |
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