Surface anchoring and dynamics of thiolated azobenzene molecules on Au(111)

Jongweon Cho*, Niv Levy, Armen Kirakosian, Matthew J. Comstock, Frank Lauterwasser, Jean Frechet, Michael F. Crommie

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

We have investigated the temperature-dependent behavior of thiolated azobenzene molecules on Au(111) using scanning tunneling microscopy. The addition of a thiol functional group to azobenzene molecules leads to increased surface anchoring of single azobenzene molecules to gold. Thiolated azobenzene shows diverse surface morphology and does not form well-ordered structures at low coverage. At elevated temperatures, anchored molecules are observed to spin in place via hindered rotation. By measuring the number of rotating molecules as a function of temperature and using a simple model, we are able to estimate the energy barrier and attempt frequency for thermally induced hindered rotation to be 102±3 meV and 110±2 GHz, respectively.

Original languageEnglish (US)
Article number034707
JournalJournal of Chemical Physics
Volume131
Issue number3
DOIs
StatePublished - Jul 30 2009

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry
  • Medicine(all)

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