Highly conducting single-molecule topological insulators based on mono- and di-radical cations
Lin Li,Jonathan Z. Low,Jan Wilhelm,Guanming Liao,Suman Gunasekaran,Claudia R. Prindle,Rachel L. Starr,Dorothea Golze,Colin Nuckolls,Michael L. Steigerwald,Ferdinand Evers,Luis M. Campos,Xiao-ying Yin,Latha Venkataraman +13 more
Reads0
Chats0
TLDR
In this article , a family of oligophenylene-bridged bis(triarylamines) with tunable and stable mono- or di-radicaloid character was studied and it was shown that the oxidized wires exhibit reversed conductance decay with increasing length.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 0.1G0, where G0 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. Designing long and highly conducting molecular wires has been a great challenge for decades. It has now been shown that a singly oxidized 2.6-nm-long oligophenylene-bridged bis(triarylamine) can show a single-molecule junction conductance over 0.1G0. read more
Citations
More filters
Journal ArticleDOI
High Seebeck Coefficient Achieved by Multinuclear Organometallic Molecular Junctions.
TL;DR: In this paper , the thermoelectric properties of molecular junctions incorporating multinuclear ruthenium alkynyl complexes with thioether anchors were investigated using the liquid metal technique.
Journal ArticleDOI
Reversed Conductance Decay of 1D Topological Insulators by Tight-Binding Analysis.
TL;DR: In this paper , a tight-binding approach is used to demonstrate that polyacetylene and other diradicaloid 1D TIs show a reversed conductance decay at the short chain limit.
Journal ArticleDOI
Topological Radical Pairs Produce Ultrahigh Conductance in Long Molecular Wires.
Liangsheng Li,Shayan Louie,Austin M. Evans,Elena Meirzadeh,Colin Nuckolls,Latha Venkataraman +5 more
TL;DR: In this article , the authors showed that a microampere current can be driven over a single ∼5 nm molecular wire, appreciably more than what has been observed in other long wires reported to date.
Journal ArticleDOI
Construction of Stable Luminescent Donor–Acceptor Neutral Radicals: A Theoretical Study
TL;DR: In this paper , stable luminescent donor-acceptor (D-A•) radical molecules with theoretically 100% internal quantum efficiency in emission have recently attracted a lot of attention, especially in light-emitting diodes.
Journal ArticleDOI
Effects of Electrode Materials on Electron Transport for Single-Molecule Junctions
Mong-Wen Gu,Chun-hsien Chen +1 more
TL;DR: In this paper , a review of electrode materials in the literature is presented, focusing on the molecular side of the interface and the basic concepts and relevant experimental techniques for electrode contact at the molecule-electrode interface.
References
More filters
Journal ArticleDOI
Generalized Gradient Approximation Made Simple
TL;DR: A simple derivation of a simple GGA is presented, in which all parameters (other than those in LSD) are fundamental constants, and only general features of the detailed construction underlying the Perdew-Wang 1991 (PW91) GGA are invoked.
Journal ArticleDOI
Solitons in polyacetylene
TL;DR: In this paper, the authors present a theoretical study of soliton formation in long-chain polyenes, including the energy of formation, length, mass, and activation energy for motion.
Journal ArticleDOI
Relativistic regular two‐component Hamiltonians
TL;DR: In this article, potential-dependent transformations are used to transform the four-component Dirac Hamiltonian to effective two-component regular Hamiltonians, which already contain the most important relativistic effects, including spin-orbit coupling.
Journal ArticleDOI
Solitons in conducting polymers
TL;DR: In this article, the authors review the theoretical models that have been developed to describe the physics of polyacetylene and related conducting polymers and summarize the relevant experimental results obtained for these materials.
Journal ArticleDOI
Electron transport in molecular wire junctions.
TL;DR: Molecular conductance junctions are structures in which single molecules or small groups of molecules conduct electrical current between two electrodes and there is still limited correspondence between experimental and theoretical studies of these systems.
Related Papers (5)
First-Principles Calculation of Water Molecules with Adsorbed Ions on the Fe(001) Surface
Norio Nunomura,Satoshi Sunada +1 more