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Mechanical compression in cofacial porphyrin cyclophane pincers

Hsu, Chunwei; Schosser, Werner M.; Zwick, Patrick; Dulić, Diana; Mayor, Marcel 1; Pauly, Fabian ; van der Zant, Herre S. J.
1 Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT)

Abstract:

Intra- and intermolecular interactions are dominating chemical processes, and their concerted interplay enables complex nonequilibrium states like life. While the responsible basic forces are typically investigated spectroscopically, a conductance measurement to probe and control these interactions in a single molecule far out of equilibrium is reported here. Specifically, by separating macroscopic metal electrodes, two π-conjugated, bridge-connected porphyrin decks are peeled off on one side, but compressed on the other side due to the covalent mechanical fixation. We observe that the conductance response shows an exceptional exponential rise by two orders of magnitude in individual breaking events during the stretching. Theoretical studies atomistically explain the measured conductance behavior by a mechanically activated increase in through-bond transport and a simultaneous strengthening of through-space coupling. Our results not only reveal the various interacting intramolecular transport channels in a molecular set of levers, but also the molecules' potential to serve as molecular electro-mechanical sensors and switches.


Verlagsausgabe §
DOI: 10.5445/IR/1000148919
Veröffentlicht am 25.07.2022
Originalveröffentlichung
DOI: 10.1039/d2sc00937d
Scopus
Zitationen: 9
Web of Science
Zitationen: 8
Dimensions
Zitationen: 10
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 13.07.2022
Sprache Englisch
Identifikator ISSN: 2041-6520, 2041-6539
KITopen-ID: 1000148919
HGF-Programm 43.32.01 (POF IV, LK 01) Molecular Materials Basis for Optics & Photonics
Erschienen in Chemical Science
Verlag Royal Society of Chemistry (RSC)
Band 13
Heft 27
Seiten 8017–8024
Nachgewiesen in Dimensions
Web of Science
Scopus
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