Nanoribbons with Non-Alternant Topology from Fusion of Polyazulene: Carbon Allotropes Beyond Graphene
| Autor: | Lea Brechmann, Daniel Ebeling, Claudio K. Krug, Gerhard Hilt, Qitang Fan, J. Michael Gottfried, André Schirmeisen, Corinna Kohlmeyer, Daniel Martin-Jimenez, Wolfgang Hieringer |
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| Rok vydání: | 2019 |
| Předmět: |
Coupling
Fusion Materials science Graphene Reaction step Polyazulene chemistry.chemical_element General Chemistry 010402 general chemistry Network topology 01 natural sciences Biochemistry Catalysis 0104 chemical sciences law.invention Colloid and Surface Chemistry chemistry law Chemical physics Metastability Density functional theory Scanning tunneling microscope Carbon Topology (chemistry) |
| Popis: | Various two-dimensional (2D) carbon allotropes with nonalternant topologies, such as pentaheptites and phagraphene, have been proposed. Predictions indicate that these metastable carbon polymorphs, which contain odd-numbered rings, possess unusual (opto)electronic properties. However, none of these materials has been achieved experimentally due to synthetic challenges. In this work, by using on-surface synthesis, nanoribbons of the nonalternant graphene allotropes, phagraphene and tetra-penta-hepta(TPH)-graphene, have been obtained by dehydrogenative C-C coupling of 2,6-polyazulene chains. These chains were formed in a preceding reaction step via on-surface Ullmann coupling of 2,6-dibromoazulene. Low-temperature scanning probe microscopies with CO-functionalized tips and density functional theory calculations have been used to elucidate their structural properties. The proposed synthesis of nonalternant carbon nanoribbons from the fusion of synthetic line-defects may pave the way for large-area preparation of novel 2D carbon allotropes. |
| Databáze: | OpenAIRE |
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