Rights statement: 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 https://chemistry-europe.onlinelibrary.wiley.com/doi/abs/10.1002/chem.201905878 This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.
Accepted author manuscript, 1.28 MB, PDF document
Available under license: CC BY-NC: Creative Commons Attribution-NonCommercial 4.0 International License
Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
| <mark>Journal publication date</mark> | 21/04/2020 |
|---|---|
| <mark>Journal</mark> | Chemistry - A European Journal |
| Issue number | 23 |
| Volume | 26 |
| Number of pages | 7 |
| Pages (from-to) | 5264-5269 |
| Publication Status | Published |
| Early online date | 31/03/20 |
| <mark>Original language</mark> | English |
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.