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Title: A reversible single-molecule switch based on activated antiaromaticity

Journal Article · · Science Advances
ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [1]; ORCiD logo [4]; ORCiD logo [2]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [1]
  1. Columbia Univ., New York, NY (United States). Dept. of Chemistry
  2. Columbia Univ., New York, NY (United States). Dept. of Applied Physics
  3. Fudan Univ., Shanghai (China)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Foundry
  5. Columbia Univ., New York, NY (United States). Dept. of Chemistry; Columbia Univ., New York, NY (United States). Dept. of Applied Physics

Single-molecule electronic devices provide researchers with an unprecedented ability to relate novel physical phenomena to molecular chemical structures. Typically, conjugated aromatic molecular backbones are relied upon to create electronic devices, where the aromaticity of the building blocks is used to enhance conductivity. We capitalize on the classical physical organic chemistry concept of Hückel antiaromaticity by demonstrating a single-molecule switch that exhibits low conductance in the neutral state and, upon electrochemical oxidation, reversibly switches to an antiaromatic high-conducting structure. We form single-molecule devices using the scanning tunneling microscope–based break-junction technique and observe an on/off ratio of ~70 for a thiophenylidene derivative that switches to an antiaromatic state with 6-4-6-p electrons. Through supporting nuclear magnetic resonance measurements, we show that the doubly oxidized core has antiaromatic character and we use density functional theory calculations to rationalize the origin of the high-conductance state for the oxidized single-molecule junction. Together, our work demonstrates how the concept of antiaromaticity can be exploited to create single-molecule devices that are highly conducting.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1432216
Journal Information:
Science Advances, Vol. 3, Issue 10; ISSN 2375-2548
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 80 works
Citation information provided by
Web of Science

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Quantum interference mediated vertical molecular tunneling transistors journal October 2018
A sub 20 nm metal-conjugated molecule junction acting as a nitrogen dioxide sensor journal January 2019
Non-aromatic annulene-based aggregation-induced emission system via aromaticity reversal process journal July 2019
Dinaphthobenzo[1,2:4,5]dicyclobutadiene: Antiaromatic and Orthogonally Tunable Electronics and Packing journal January 2019
Side-group chemical gating via reversible optical and electric control in a single molecule transistor journal March 2019
Electron transport behavior of quinoidal heteroacene-based junctions: effective electron-transport pathways and quantum interference. text January 2018
Isomeric effects tuning the electron transport in carotenoid derivatives: from ohmic to rectifier behavior journal August 2018
Two-electron transfer stabilized by excited-state aromatization journal November 2019
Direct Au–C contacts based on biphenylene for single molecule circuits journal January 2018
A theoretical study on a series of polycyclic conjugated hydrocarbons—dinaphthobenzo[1,2:4,5]dicyclobutadienes with tunable charge transport properties by controlling [ N ]phenylenes and (anti)aromaticity journal January 2019
Multicenter-Bond-Based Quantum Interference in Charge Transport Through Single-Molecule Carborane Junctions journal June 2019
Versatile electrochemical approaches towards the fabrication of molecular electronic devices journal January 2020
Exploring antiaromaticity in single-molecule junctions formed from biphenylene derivatives journal January 2019
Dinaphthobenzo[1,2:4,5]dicyclobutadiene: Antiaromatic and Orthogonally Tunable Electronics and Packing journal January 2019
Transition from stochastic events to deterministic ensemble average in electron transfer reactions revealed by single-molecule conductance measurement journal February 2019
Electrical and spin switches in single‐molecule junctions journal December 2019
Multicenter‐Bond‐Based Quantum Interference in Charge Transport Through Single‐Molecule Carborane Junctions journal June 2019
Electronegativity, symmetry, and bond strength intrinsically control charge transport through five-membered single-molecule junction journal October 2019
Electron transport behavior of quinoidal heteroacene-based junctions: effective electron-transport pathways and quantum interference journal January 2018
Spin Logic Gates Operated by Protonation and Magnetism in Molecular Combinational Circuits journal April 2019
Concepts in the design and engineering of single-molecule electronic devices journal February 2019


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