Understanding the Role of Parallel Pathways via In-Situ Switching of Quantum Interference in Molecular Tunneling Junctions

Saurabh Soni, Gang Ye, Jueting Zheng, Yanxi Zhang, Andika Asyuda, Michael Zharnikov, Wenjing Hong (Corresponding author), Ryan C. Chiechi (Corresponding author)

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

10 Citaten (Scopus)

Samenvatting

This study describes the modulation of tunneling probabilities in molecular junctions by switching one of two parallel intramolecular pathways. A linearly conjugated molecular wire provides a rigid framework that allows a second, cross-conjugated pathway to be effectively switched on and off by protonation, affecting the total conductance of the junction. This approach works because a traversing electron interacts with the entire quantum-mechanical circuit simultaneously; Kirchhoff's rules do not apply. We confirm this concept by comparing the conductances of a series of compounds with single or parallel pathways in large-area junctions using EGaIn contacts and single-molecule break junctions using gold contacts. We affect switching selectively in one of two parallel pathways by converting a cross-conjugated carbonyl carbon into a trivalent carbocation, which replaces destructive quantum interference with a symmetrical resonance, causing an increase in transmission in the bias window.

Originele taal-2Engels
Pagina's (van-tot)14308-14312
Aantal pagina's5
TijdschriftAngewandte Chemie - International Edition
Volume59
Nummer van het tijdschrift34
Vroegere onlinedatum29 mei 2020
DOI's
StatusGepubliceerd - 17 aug 2020

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