Dresden 2020 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 7: Focus Session: Functional Molecules at Surfaces I
O 7.11: Vortrag
Montag, 16. März 2020, 13:15–13:30, TRE Ma
Nanoribbons with Non-Alternant Topology from Fusion of Polyazulene: Carbon Allotropes Beyond Graphene — •Qitang Fan1, Daniel Martin-Jimenez2, Daniel Ebeling2, Claudio K. Krug1, Lea Brechmann3, Corinna Kohlmeyer3, Gerhard Hilt3, Wolfgang Hieringer4, André Schirmeisen2, and J. Michael Gottfried1 — 1Department of Chemistry, Philipps University Marburg, Germany — 2Institute of Applied Physics, Justus Liebig University Gießen, Germany — 3Institute of Chemistry, Carl von Ossietzky University Oldenburg, Germany — 4Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany
Various two-dimensional carbon allotropes with nonalternant topologies, such as pentaheptites, have been proposed. Predictions indicate that these metastable carbon polymorphs possess unusual (opto)electronic properties. However, none of these materials has been achieved experimentally due to synthetic challenges. Here, by using on-surface synthesis, nonalternant phagraphene and tetra-penta-hepta graphene nanoribbons have been obtained by dehydrogenative C-C coupling of 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 tip and DFT calculations have been used to elucidate their structural properties. The proposed synthesis of nonalternant carbon nanoribbons from fusion of synthetic line defects may pave the way for the preparation of novel 2D carbon allotropes.