Bianthrone at a Metal Surface: Conductance Switching with a Bistable Molecule Made Feasible by Image Charge Effects
Paper in proceedings, 2015

Bianthrone is a sterically hindered compound that exists in the form of two non-planar isomers. Our experimental study of single-molecule junctions with bianthrone reveals persistent switching of electric conductance at low temperatures, which can be reasonably associated to molecular isomerization events. Temperature dependence of the switching rate allows for an estimate of the activation energy of the process, on the order of 35-90 meV. Quantum-chemical calculations of the potential surface of neutral bianthrone and its anion, including identification of transition states, yields the isolated molecule isomerization barriers too high vs. the previous estimate, though in perfect agreement with previous experimental studies in solution. Nevertheless, we show that the attraction of the anion in the vicinity of the metal surface by its image charge can significantly alter the energetic landscape, in particular, by reducing the barrier to the values compatible with the observed switching behavior.

bianthrone

single-molecule junction

image charge effect

hybrid DFT calculation

conformational switch

Author

V. Geskin

Université de Mons

Samuel Lara Avila

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Andrey Danilov

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Sergey Kubatkin

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

S. Bouzakraoui

Université de Mons

J. Cornil

Université de Mons

T. Bjomholm

University of Copenhagen

AIP Conference Proceedings

0094-243X (ISSN) 1551-7616 (eISSN)

Vol. 1642 469-472 4906722

International Conference of Computational Methods in Sciences and Engineering 2010, ICCMSE 2010
Kos, Greece,

Subject Categories

Physical Chemistry

Condensed Matter Physics

DOI

10.1063/1.4906722

More information

Latest update

11/14/2019