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

Jongweon Cho; Niv Levy; Armen Kirakosian; Matthew J. Comstock; Frank Lauterwasser; Jean M.J. Fŕchet; Michael F. Crommie

doi:10.1063/1.3168524

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

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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

10 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 language	English (US)
Article number	034707
Journal	JOURNAL OF CHEMICAL PHYSICS
Volume	131
Issue number	3
DOIs	https://doi.org/10.1063/1.3168524
State	Published - 2009
Externally published	Yes

ASJC Scopus subject areas

General Physics and Astronomy
Physical and Theoretical Chemistry

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10.1063/1.3168524

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title = "Surface anchoring and dynamics of thiolated azobenzene molecules on Au(111)",

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.",

author = "Jongweon Cho and Niv Levy and Armen Kirakosian and Comstock, {Matthew J.} and Frank Lauterwasser and F{\'r}chet, {Jean M.J.} and Crommie, {Michael F.}",

note = "Funding Information: We are grateful to Luis Berbil-Batista and Dan Poulsen for helpful discussions. Financial support for this work was provided by the Director, Office of Science, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering Division, U.S. Department of Energy under Contract No. DE-AC03-76SF0098.",

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AU - Cho, Jongweon

AU - Levy, Niv

AU - Kirakosian, Armen

AU - Comstock, Matthew J.

AU - Lauterwasser, Frank

AU - Fŕchet, Jean M.J.

AU - Crommie, Michael F.

N1 - Funding Information: We are grateful to Luis Berbil-Batista and Dan Poulsen for helpful discussions. Financial support for this work was provided by the Director, Office of Science, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering Division, U.S. Department of Energy under Contract No. DE-AC03-76SF0098.

PY - 2009

Y1 - 2009

N2 - 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.

AB - 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.

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

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