Details

Autor(en) / Beteiligte

• Daugherty, Michael C.
• Jacobse, Peter H.
• Jiang, Jingwei
• Jornet-Somoza, Joaquim
• Dorit, Reis
• Wang, Ziyi
• Lu, Jiaming
• McCurdy, Ryan
• Tang, Weichen
• Rubio, Angel
• Louie, Steven G.
• Crommie, Michael F.
• Fischer, Felix R.

Titel

Regioselective On-Surface Synthesis of [3]Triangulene Graphene Nanoribbons

Ist Teil von

• Journal of the American Chemical Society, 2024-05, Vol.146 (23), p.15879-15886

Ort / Verlag

United States: American Chemical Society

Erscheinungsjahr

2024

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The integration of low-energy states into bottom-up engineered graphene nanoribbons (GNRs) is a robust strategy for realizing materials with tailored electronic band structure for nanoelectronics. Low-energy zero-modes (ZMs) can be introduced into nanographenes (NGs) by creating an imbalance between the two sublattices of graphene. This phenomenon is exemplified by the family of [n]­triangulenes (n ∈ N ). Here, we demonstrate the synthesis of [3]­triangulene-GNRs, a regioregular one-dimensional (1D) chain of [3]­triangulenes linked by five-membered rings. Hybridization between ZMs on adjacent [3]­triangulenes leads to the emergence of a narrow band gap, E g,exp ∼ 0.7 eV, and topological end states that are experimentally verified using scanning tunneling spectroscopy. Tight-binding and first-principles density functional theory calculations within the local density approximation corroborate our experimental observations. Our synthetic design takes advantage of a selective on-surface head-to-tail coupling of monomer building blocks enabling the regioselective synthesis of [3]­triangulene-GNRs. Detailed ab initio theory provides insights into the mechanism of on-surface radical polymerization, revealing the pivotal role of Au–C bond formation/breakage in driving selectivity.