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Synthetic Control of Quantum Interference by Regulating Charge on a Single Atom in Heteroaromatic Molecular Junctions

[Image: see text] A key area of activity in contemporary molecular electronics is the chemical control of conductance of molecular junctions and devices. Here we study and modify a range of pyrrolodipyridines (carbazole-like) molecular wires. We are able to change the electrical conductance and quan...

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Autores principales: Naghibi, Saman, Ismael, Ali K., Vezzoli, Andrea, Al-Khaykanee, Mohsin K., Zheng, Xijia, Grace, Iain M., Bethell, Donald, Higgins, Simon J., Lambert, Colin J., Nichols, Richard J.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2019
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7007252/
https://www.ncbi.nlm.nih.gov/pubmed/31577147
http://dx.doi.org/10.1021/acs.jpclett.9b02319
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author Naghibi, Saman
Ismael, Ali K.
Vezzoli, Andrea
Al-Khaykanee, Mohsin K.
Zheng, Xijia
Grace, Iain M.
Bethell, Donald
Higgins, Simon J.
Lambert, Colin J.
Nichols, Richard J.
author_facet Naghibi, Saman
Ismael, Ali K.
Vezzoli, Andrea
Al-Khaykanee, Mohsin K.
Zheng, Xijia
Grace, Iain M.
Bethell, Donald
Higgins, Simon J.
Lambert, Colin J.
Nichols, Richard J.
author_sort Naghibi, Saman
collection PubMed
description [Image: see text] A key area of activity in contemporary molecular electronics is the chemical control of conductance of molecular junctions and devices. Here we study and modify a range of pyrrolodipyridines (carbazole-like) molecular wires. We are able to change the electrical conductance and quantum interference patterns by chemically regulating the bridging nitrogen atom in the tricyclic ring system. A series of eight different N-substituted pyrrolodipyridines has been synthesized and subjected to single-molecule electrical characterization using an STM break junction. Correlations of these experimental data with theoretical calculations underline the importance of the pyrrolic nitrogen in facilitating conductance across the molecular bridge and controlling quantum interference. The large chemical modulation for the meta-connected series is not apparent for the para-series, showing the competition between (i) meta-connectivity quantum interference phenomena and (ii) the ability of the pyrrolic nitrogen to facilitate conductance, that can be modulated by chemical substitution.
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spelling pubmed-70072522020-02-10 Synthetic Control of Quantum Interference by Regulating Charge on a Single Atom in Heteroaromatic Molecular Junctions Naghibi, Saman Ismael, Ali K. Vezzoli, Andrea Al-Khaykanee, Mohsin K. Zheng, Xijia Grace, Iain M. Bethell, Donald Higgins, Simon J. Lambert, Colin J. Nichols, Richard J. J Phys Chem Lett [Image: see text] A key area of activity in contemporary molecular electronics is the chemical control of conductance of molecular junctions and devices. Here we study and modify a range of pyrrolodipyridines (carbazole-like) molecular wires. We are able to change the electrical conductance and quantum interference patterns by chemically regulating the bridging nitrogen atom in the tricyclic ring system. A series of eight different N-substituted pyrrolodipyridines has been synthesized and subjected to single-molecule electrical characterization using an STM break junction. Correlations of these experimental data with theoretical calculations underline the importance of the pyrrolic nitrogen in facilitating conductance across the molecular bridge and controlling quantum interference. The large chemical modulation for the meta-connected series is not apparent for the para-series, showing the competition between (i) meta-connectivity quantum interference phenomena and (ii) the ability of the pyrrolic nitrogen to facilitate conductance, that can be modulated by chemical substitution. American Chemical Society 2019-10-02 2019-10-17 /pmc/articles/PMC7007252/ /pubmed/31577147 http://dx.doi.org/10.1021/acs.jpclett.9b02319 Text en Copyright © 2019 American Chemical Society This is an open access article published under a Creative Commons Attribution (CC-BY) License (http://pubs.acs.org/page/policy/authorchoice_ccby_termsofuse.html) , which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.
spellingShingle Naghibi, Saman
Ismael, Ali K.
Vezzoli, Andrea
Al-Khaykanee, Mohsin K.
Zheng, Xijia
Grace, Iain M.
Bethell, Donald
Higgins, Simon J.
Lambert, Colin J.
Nichols, Richard J.
Synthetic Control of Quantum Interference by Regulating Charge on a Single Atom in Heteroaromatic Molecular Junctions
title Synthetic Control of Quantum Interference by Regulating Charge on a Single Atom in Heteroaromatic Molecular Junctions
title_full Synthetic Control of Quantum Interference by Regulating Charge on a Single Atom in Heteroaromatic Molecular Junctions
title_fullStr Synthetic Control of Quantum Interference by Regulating Charge on a Single Atom in Heteroaromatic Molecular Junctions
title_full_unstemmed Synthetic Control of Quantum Interference by Regulating Charge on a Single Atom in Heteroaromatic Molecular Junctions
title_short Synthetic Control of Quantum Interference by Regulating Charge on a Single Atom in Heteroaromatic Molecular Junctions
title_sort synthetic control of quantum interference by regulating charge on a single atom in heteroaromatic molecular junctions
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7007252/
https://www.ncbi.nlm.nih.gov/pubmed/31577147
http://dx.doi.org/10.1021/acs.jpclett.9b02319
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