Constructive Quantum Interference in Single-Molecule Benzodichalcogenophene Junctions

Baghernejad, M. and Yang, Y. and Al-Owaedi, O.A. and Aeschi, Y. and Zeng, B.-F. and Abd Dawood, Z.M. and Li, X. and Liu, J. and Shi, J. and Decurtins, S. and Liu, S.-X. and Hong, W. and Lambert, C.J. (2020) Constructive Quantum Interference in Single-Molecule Benzodichalcogenophene Junctions. Chemistry - A European Journal, 26 (23). pp. 5264-5269. ISSN 0947-6539

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Heteroatom substitution into the cores of alternant, aromatic hydrocarbons containing only even-membered rings is attracting increasing interest as a method of tuning their electrical conductance. Here, the effect of heteroatom substitution into molecular cores of non-alternant hydrocarbons, containing odd-membered rings, is examined. Benzodichalcogenophene (BDC) compounds are rigid, planar pi-conjugated structures, with molecular cores containing five-membered rings fused to a six-membered aryl ring. To probe the sensitivity or resilience of constructive quantum interference (CQI) in these non-bipartite molecular cores, two C-2-symmetric molecules (I and II) and one asymmetric molecule (III) were investigated. I (II) contains S (O) heteroatoms in each of the five-membered rings, while III contains an S in one five-membered ring and an O in the other. Differences in their conductances arise primarily from the longer S-C and shorter O-C bond lengths compared with the C-C bond and the associated changes in their resonance integrals. Although the conductance of III is significantly lower than the conductances of the others, CQI was found to be resilient and persist in all molecules.

Item Type:
Journal Article
Journal or Publication Title:
Chemistry - A European Journal
Additional Information:
This is the peer reviewed version of the following article: M. Baghernejad, Y. Yang, O. A. Al-Owaedi, Y. Aeschi, B.-F. Zeng, Z. M. Abd Dawood, X. Li, J. Liu, J. Shi, S. Decurtins, S.-X. Liu, W. Hong, C. J. Lambert, Chem. Eur. J. 2020, 26, 5264 which has been published in final form at This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.
Uncontrolled Keywords:
?? density functional calculationsperturbation theoryquantum interferencescanning tunneling microscopysingle-molecule conductorschemistry(all) ??
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Deposited On:
21 Aug 2020 10:00
Last Modified:
04 Jan 2024 00:23