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Fan_biphenylene_sheet_18.12.2020_ChemRxiv.pdf (2.69 MB)

Biphenylene Sheet: A Nonbenzenoid Carbon Allotrope

submitted on 18.12.2020, 20:33 and posted on 21.12.2020, 13:11 by Qitang Fan, Linghao Yan, Matthias W Tripp, Ondrej Krejci, Stavrina Dimosthenous, Stefan R. Kachel, Mengyi Chen, Adam S. Foster, Ulrich Koert, Peter Liljeroth, Michael Gottfried
The quest for planar sp2-hybridized carbon allotropes other than graphene, such as graphenylene and biphenylene sheet, has stimulated substantial research efforts because of the materials' predicted unique mechanical, electronic and transport properties. However, their synthesis remains challenging due to the lack of reliable protocols for generating non-hexagonal rings during the in-plane tiling of carbon atoms. Here, we report the bottom-up growth of ultra-flat biphenylene sheet with periodically arranged four-, six-, and eight-membered rings of sp2 carbon atoms, via an unprecedented on-surface inter-polymer hydrogen fluoride (HF)-zipping reaction. The characterization of this biphenylene sheet by scanning probe methods solves the long-standing controversy over its dielectric or metallic nature. We expect the inter-polymer HF-zipping method to complement the toolbox for the synthesis of other nonbenzenoid carbon allotropes.


DFG 223848855-SFB1083

DFG GO1812/2

European Research Council, ERC-2017-AdG no. 788185

Academy of Finland, Academy professor funding no.318995 and 320555, and project nos. 311012 and 314882)

Alexander von Humboldt Foundation

Marie Skłodowska-Curie Actions Individual Fellowship no. 839242 and no. 845060

World Premier International Research Center Initiative (WPI), MEXT, Japan


Email Address of Submitting Author


Philipps University of Marburg



ORCID For Submitting Author


Declaration of Conflict of Interest

No conflict of interest