Abstract
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.
Original language | English |
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Pages (from-to) | 14308-14312 |
Journal | Angewandte Chemie (international edition) |
Volume | 59 |
Issue number | 34 |
DOIs | |
Publication status | Published - 17 Aug 2020 |
Externally published | Yes |
Keywords
- EGaIn
- Molecular electronics
- Quantum interference
- Self-assembled monolayers (SAMs)
- STM-BJ