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Saurabh Soni Gang Ye Jueting Zheng Yanxi Zhang Andika Asyuda Michael Zharnikov Wenjing Hong Ryan C. Chiechi 《Angewandte Chemie (International ed. in English)》2020,59(34):14308-14312
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. 相似文献
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Andika Fajar Valéry Bourny Hiroshi Orihara 《Molecular Crystals and Liquid Crystals》2013,570(1):653-660
Abstract The anomalous increase of Kerr effect due to pretransitional fluctuations has been investigated in the SmA phase close to the SmA-SmCα* transition point in antiferroelectric liquid crystals MHPOBC and MHPOCBC. We have developed a Landau theory taking into account the fluctuations and shown that there are two contributions to the Kerr effect. On the basis of theoretical results, the experimental results obtained in MHPOBC and MHPOCBC were discussed and a clear evidence of the fluctuation-induced Kerr effect was presented. 相似文献
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Saurabh Soni Dr. Gang Ye Jueting Zheng Dr. Yanxi Zhang Andika Asyuda Prof. Michael Zharnikov Prof. Wenjing Hong Assoc. Prof. Ryan C. Chiechi 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(34):14414-14418
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. 相似文献
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