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

Naghibi, S. and Ismael, A.K. and Vezzoli, A. and Al-Khaykanee, M.K. and Zheng, X. and Grace, I.M. and Bethell, D. and Higgins, S.J. and Lambert, C.J. and Nichols, R.J. (2019) Synthetic Control of Quantum Interference by Regulating Charge on a Single Atom in Heteroaromatic Molecular Junctions. Journal of Physical Chemistry Letters, 10 (20). pp. 6419-6424. ISSN 1948-7185

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Abstract

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.

Item Type:
Journal Article
Journal or Publication Title:
Journal of Physical Chemistry Letters
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2500
Subjects:
ID Code:
138203
Deposited By:
Deposited On:
24 Oct 2019 14:15
Refereed?:
Yes
Published?:
Published
Last Modified:
30 Sep 2020 09:22