Constructive Quantum Interference in Single‐Molecule Benzodichalcogenophene Junctions

Lambert, Colin John; Baghernejad, Masoud; Yang, Yang; Al Owaedi, Oday; Aeshchi, Yyves; Zeng, Biao-Feng; Dawood, Zahra; Li, Xiaohui; Liu, Junyang; Shi, Jia; Decurtins, Silvio; Liu, Shi-Xia; Hong, Wenjing (2020). Constructive Quantum Interference in Single‐Molecule Benzodichalcogenophene Junctions. Chemistry - a European journal, 26(23), pp. 5264-5269. Wiley-VCH 10.1002/chem.201905878

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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 we examine the effect of heteroatom substitution into molecular cores of non‐alternant hydrocarbons, containing odd‐membered rings. Benzodichalcogenophene (BDC) compounds are rigid, planar π‐conjugated structures, with molecular cores containing 5‐membered rings fused to a 6‐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) are investigated. I (II) contains S (O) heteroatoms in each of the 5‐membered rings, while III contains an S in one 5‐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. We find that although the conductance of III is significantly lower than the conductances of the others, CQI is resilient and persists in all molecules.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Departement of Chemistry and Biochemistry

UniBE Contributor:

Decurtins, Silvio and Liu, Shi-Xia

Subjects:

500 Science > 570 Life sciences; biology
500 Science > 540 Chemistry

ISSN:

0947-6539

Publisher:

Wiley-VCH

Language:

English

Submitter:

Silvio Decurtins

Date Deposited:

18 Feb 2020 12:04

Last Modified:

21 Apr 2020 01:32

Publisher DOI:

10.1002/chem.201905878

BORIS DOI:

10.7892/boris.140065

URI:

https://boris.unibe.ch/id/eprint/140065

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