Unveiling the Multiradical Character of the Biphenylene Network and Its Anisotropic Charge Transport.

Abstract
Recent progress in the on-surface synthesis and characterization of nanomaterials is facilitating the realization of new carbon allotropes, such as nanoporous graphenes, graphynes, and 2D π-conjugated polymers. One of the latest examples is the biphenylene network (BPN), which was recently fabricated on gold and characterized with atomic precision. This gapless 2D organic material presents uncommon metallic conduction, which could help develop innovative carbon-based electronics. Here, using first principles calculations and quantum transport simulations, we provide new insights into some fundamental properties of BPN, which are key for its further technological exploitation. We predict that BPN hosts an unprecedented spin-polarized multiradical ground state, which has important implications for the chemical reactivity of the 2D material under practical use conditions. The associated electronic band gap is highly sensitive to perturbations, as seen in finite temperature (300 K) molecular dynamics simulations, but the multiradical character remains stable. Furthermore, BPN is found to host in-plane anisotropic (spin-polarized) electrical transport, rooted in its intrinsic structural features, which suggests potential device functionality of interest for both nanoelectronics and spintronics.

Citation
Alcón, I., Calogero, G., Papior, N., Antidormi, A., Song, K., Cummings, A. W., Brandbyge, M., & Roche, S. (2022). Unveiling the Multiradical Character of the Biphenylene Network and Its Anisotropic Charge Transport. Journal of the American Chemical Society. https://doi.org/10.1021/jacs.2c02178

Acknowledgements
I.A. is grateful for a Juan de la Cierva postdoctoral grant (FJC2019-038971-I) from the Spanish Ministerio de Ciencia e Innovación. Financial support by Villum Fonden (00013340) is gratefully acknowledged. ICN2 is funded by the CERCA Programme from Generalitat de Catalunya and is supported by the Severo Ochoa program from Spanish MINECO (grant no. SEV-2017-0706). The Center for Nanostructured Graphene (CNG) is sponsored by the Danish National Research Foundation (DNRF103). S.R. acknowledges funding from the European Union Seventh Framework Programme under grant no. 881603 (Graphene Flagship).

Publisher
American Chemical Society (ACS)

Journal
Journal of the American Chemical Society

DOI
10.1021/jacs.2c02178

PubMed ID
35476458

Additional Links
https://pubs.acs.org/doi/10.1021/jacs.2c02178

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