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    Rights statement: This is the peer reviewed version of the following article: Jiang, F., Trupp, D.I., Algethami, N., Zheng, H., He, W., Alqorashi, A., Zhu, C., Tang, C., Li, R., Liu, J., Sadeghi, H., Shi, J., Davidson, R., Korb, M., Sobolev, A.N., Naher, M., Sangtarash, S., Low, P.J., Hong, W. and Lambert, C.J. (2019), Turning the Tap: Conformational Control of Quantum Interference to Modulate Single‐Molecule Conductance. Angew. Chem. Int. Ed.. doi:10.1002/anie.201909461 which has been published in final form at https://onlinelibrary.wiley.com/doi/full/10.1002/anie.201909461 This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.

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Turning the Tap: Conformational Control of Quantum Interference to Modulate Single-Molecule Conductance

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<mark>Journal publication date</mark>19/12/2019
<mark>Journal</mark>Angewandte Chemie - International Edition
Issue number52
Volume58
Number of pages7
Pages (from-to)18987-18993
Publication StatusPublished
Early online date31/10/19
<mark>Original language</mark>English

Abstract

Together with the more intuitive and commonly recognized conductance mechanisms of charge-hopping and tunneling, quantum-interference (QI) phenomena have been identified as important factors affecting charge transport through molecules. Consequently, establishing simple and flexible molecular-design strategies to understand, control, and exploit QI in molecular junctions poses an exciting challenge. Here we demonstrate that destructive quantum interference (DQI) in meta-substituted phenylene ethylene-type oligomers (m-OPE) can be tuned by changing the position and conformation of methoxy (OMe) substituents at the central phenylene ring. These substituents play the role of molecular-scale taps, which can be switched on or off to control the current flow through a molecule. Our experimental results conclusively verify recently postulated magic-ratio and orbital-product rules, and highlight a novel chemical design strategy for tuning and gating DQI features to create single-molecule devices with desirable electronic functions.

Bibliographic note

This is the peer reviewed version of the following article: Jiang, F., Trupp, D.I., Algethami, N., Zheng, H., He, W., Alqorashi, A., Zhu, C., Tang, C., Li, R., Liu, J., Sadeghi, H., Shi, J., Davidson, R., Korb, M., Sobolev, A.N., Naher, M., Sangtarash, S., Low, P.J., Hong, W. and Lambert, C.J. (2019), Turning the Tap: Conformational Control of Quantum Interference to Modulate Single‐Molecule Conductance. Angew. Chem. Int. Ed.. doi:10.1002/anie.201909461 which has been published in final form at https://onlinelibrary.wiley.com/doi/full/10.1002/anie.201909461 This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.