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Enhanced Separation Concept (ESC)

Removing the Functional Subunit from the Electrode by Molecular Design

Journal Article (2019)
Author(s)

Thomas Brandl (University of Basel)

M. El Abbassi (TU Delft - QN/van der Zant Lab, Kavli institute of nanoscience Delft)

D. Stefani (Kavli institute of nanoscience Delft, TU Delft - QN/van der Zant Lab)

R. Frisenda (TU Delft - QN/van der Zant Lab, Kavli institute of nanoscience Delft)

Gero D. Harzmann (University of Basel)

H.S.J. van der Zant (Kavli institute of nanoscience Delft, TU Delft - QN/van der Zant Lab)

Marcel Mayor (Karlsruhe Institut für Technologie, Sun Yat-sen University, University of Basel)

Research Group
QN/van der Zant Lab
Copyright
© 2019 Thomas Brandl, M. El Abbassi, D. Stefani, R. Frisenda, Gero D. Harzmann, H.S.J. van der Zant, Marcel Mayor
DOI related publication
https://doi.org/10.1002/ejoc.201900432
More Info
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Publication Year
2019
Language
English
Copyright
© 2019 Thomas Brandl, M. El Abbassi, D. Stefani, R. Frisenda, Gero D. Harzmann, H.S.J. van der Zant, Marcel Mayor
Research Group
QN/van der Zant Lab
Issue number
31-32
Volume number
2019
Pages (from-to)
5334-5343
Reuse Rights

Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.

Abstract

A new concept to improve the reliability of functional single molecule junctions is presented using the E-field triggered switching of FeIIbis-terpyridine complexes in a mechanically controlled break junction experiment as model system. The complexes comprise a push-pull ligand sensing the applied E-field and the resulting distortion of the FeII ligand field is expected to trigger a spin-crossover event reflected in a sudden jump of the transport current. By molecular engineering, the active centre of the complex is separated from the gold electrodes in order to eliminate undesired side-effects. Two aspects are considered to isolate the central metal ion, namely the spacing by introducing additional alkynes, and the steric shielding achieved by bulky isopropyl groups. With this small series of model complexes, a pronounced correlation is observed between the occurrence of bistable junctions and the extent of separation of the central metal ion, affirming the hypothesized Enhanced Separation Concept (ESC).