High conductance values in π-folded molecular junctions

Marco Carini, Marta P. Ruiz, Imanol Usabiaga, José A. Fernández, Emilio J. Cocinero, Manuel Melle-Franco (), Ismael Diez-Perez () and Aurelio Mateo-Alonso ()
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Marco Carini: POLYMAT, University of the Basque Country UPV/EHU
Marta P. Ruiz: Institute of Theoretical and Computational Chemistry, University of Barcelona
Imanol Usabiaga: Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV/EHU)
José A. Fernández: Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV/EHU)
Emilio J. Cocinero: Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV/EHU)
Manuel Melle-Franco: CICECO—Aveiro Institute of Materials, University of Aveiro
Ismael Diez-Perez: Institute of Theoretical and Computational Chemistry, University of Barcelona
Aurelio Mateo-Alonso: POLYMAT, University of the Basque Country UPV/EHU

Nature Communications, 2017, vol. 8, issue 1, 1-10

Abstract: Abstract Folding processes play a crucial role in the development of function in biomacromolecules. Recreating this feature on synthetic systems would not only allow understanding and reproducing biological functions but also developing new functions. This has inspired the development of conformationally ordered synthetic oligomers known as foldamers. Herein, a new family of foldamers, consisting of an increasing number of anthracene units that adopt a folded sigmoidal conformation by a combination of intramolecular hydrogen bonds and aromatic interactions, is reported. Such folding process opens up an efficient through-space charge transport channel across the interacting anthracene moieties. In fact, single-molecule conductance measurements carried out on this series of foldamers, using the scanning tunnelling microscopy-based break-junction technique, reveal exceptionally high conductance values in the order of 10−1 G0 and a low length decay constant of 0.02 Å−1 that exceed the values observed in molecular junctions that make use of through-space charge transport pathways.

Date: 2017
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DOI: 10.1038/ncomms15195

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