Issue 18, 2019

Six state molecular revolver mounted on a rigid platform


The rotation of entire molecules or large moieties happens at 100 ps time scales and the transition process itself is experimentally inaccessible to scanning probe techniques. However, the reversible switching of a molecule between more than two metastable states allows to assign a rotational switching direction. Rotational switching is a phenomenon that is particularly interesting with regard to possible applications in molecular motors. In this work, single tetraphenylmethane molecules deposited on a Au(111) surface were studied in a low temperature scanning tunneling microscope (STM). These molecules comprise rotational axes mounted on a tripodal sulfur-anchored stand and with the STM tip, we were able to induce transitions between six rotational states of the molecular motif. We were able to identify critical parameters for the onset of rotational switching and to characterize the influence of the local environment. The subtle difference between fcc and hcp stacking and the rotational state of neighboring molecules clearly influence the population of the rotational states.

Graphical abstract: Six state molecular revolver mounted on a rigid platform

Article information

Article type
09 Jan 2019
09 Apr 2019
First published
25 Apr 2019
This article is Open Access
Creative Commons BY license

Nanoscale, 2019,11, 9015-9022

Six state molecular revolver mounted on a rigid platform

J. Homberg, M. Lindner, L. Gerhard, K. Edelmann, T. Frauhammer, Y. Nahas, M. Valášek, M. Mayor and W. Wulfhekel, Nanoscale, 2019, 11, 9015 DOI: 10.1039/C9NR00259F

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