Electron Stimulation of Internal Torsion of a Surface-Mounted Molecular Rotor

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

17 Scopus Citations
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Author(s)

  • Weihua Wang
  • Xingqiang Shi
  • Mochen Jin
  • Christian Minot
  • Michel A. Van Hove
  • And 2 others
  • Jean-Paul Collin
  • Nian Lin

Detail(s)

Original languageEnglish
Pages (from-to)4929-4935
Journal / PublicationACS Nano
Volume4
Issue number8
Online published21 Jul 2010
Publication statusPublished - 24 Aug 2010

Abstract

A molecular rotor which includes a central rotator group was investigated by scanning tunneling microscopy at 4.9 K as it was grafted on a Cu(111) surface via its two terminal groups. Topographs with submolecular resolution revealed several distinct molecular conformations which we attribute to different angular orientations of the rotator and which are locally stable states according to density functional theory calculations. Time-resolved tunneling current spectra showed that the rotator undergoes a torsional motion around the molecular long axis as stimulated by tunneling electrons in a one-electron process with an excitation energy threshold of 355 meV. Calculations identified an intrinsic axial vibration mode of the rotator group at 370 meV as adsorbed on the surface, which we propose to be the channel for effectively converting the tunneling electron energy into the mechanical energy of the intramolecular torsion.

Research Area(s)

  • Density functional theory calculation, Electron excitation, Molecular rotor, Scanning tunneling microscopy

Citation Format(s)

Electron Stimulation of Internal Torsion of a Surface-Mounted Molecular Rotor. / Wang, Weihua; Shi, Xingqiang; Jin, Mochen et al.
In: ACS Nano, Vol. 4, No. 8, 24.08.2010, p. 4929-4935.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review