Li, Liang and Low, Jonathan Z. and Wilhelm, Jan and Liao, Guanming and Gunasekaran, Suman and Prindle, Claudia R. and Starr, Rachel L. and Golze, Dorothea and Nuckolls, Colin and Steigerwald, Michael L. and Evers, Ferdinand and Campos, Luis M. and Yin, Xiaodong and Venkataraman, Latha (2022) Highly conducting single-molecule topological insulators based on mono- and di-radical cations. NATURE CHEMISTRY, 14 (9). pp. 1061-1067. ISSN 1755-4330, 1755-4349
Full text not available from this repository. (Request a copy)Abstract
Single-molecule topological insulators are promising candidates as conducting wires over nanometre length scales. A key advantage is their ability to exhibit quasi-metallic transport, in contrast to conjugated molecular wires which typically exhibit a low conductance that decays as the wire length increases. Here, we study a family of oligophenylene-bridged bis(triarylamines) with tunable and stable mono- or di-radicaloid character. These wires can undergo one- and two-electron chemical oxidations to the corresponding mono-cation and di-cation, respectively. We show that the oxidized wires exhibit reversed conductance decay with increasing length, consistent with the expectation for Su-Schrieffer-Heeger-type one-dimensional topological insulators. The 2.6-nm-long di-cation reported here displays a conductance greater than 0.1G(0), where G(0) is the conductance quantum, a factor of 5,400 greater than the neutral form. The observed conductance-length relationship is similar between the mono-cation and di-cation series. Density functional theory calculations elucidate how the frontier orbitals and delocalization of radicals facilitate the observed non-classical quasi-metallic behaviour.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ELECTRON-TRANSPORT; CHARGE-TRANSPORT; TRANSMISSION; RESISTANCE; JUNCTIONS; CIRCUITS; POLYMERS; SOLITONS |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Ferdinand Evers |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 16 Feb 2024 06:11 |
| Last Modified: | 16 Feb 2024 06:11 |
| URI: | https://pred.uni-regensburg.de/id/eprint/57864 |
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