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2019-07-24_Fan_Nanoribbons_final.pdf (3.72 MB)

Nanoribbons with Non-Alternant Topology from Fusion of Polyazulene: Carbon Allotropes Beyond Graphene

preprint
submitted on 03.08.2019, 08:58 and posted on 05.08.2019, 15:33 by Qitang Fan, Daniel Martin-Jimenez, Daniel Ebeling, Claudio K. Krug, Lea Brechmann, Corinna Kohlmeyer, Gerhard Hilt, Wolfgang Hieringer, André Schirmeisen, Michael Gottfried
Various two-dimensional (2D) carbon allotropes with non-alternant 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 non-alternant 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 tip and density functional theory calculations have been used to elucidate their structural properties.

History

Email Address of Submitting Author

michael.gottfried@chemie.uni-marburg.de

Institution

University of Marburg

Country

Germany

ORCID For Submitting Author

0000-0001-5579-2568

Declaration of Conflict of Interest

No conflict of interests