Scanning tunneling microscopy study of single molecule motion on the Si(100)- 2×1 surface

R. Basu, J. D. Tovar, Mark C Hersam

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21 Citations (Scopus)

Abstract

Room temperature ultrahigh vacuum (UHV) scanning tunneling microscopy (STM) is used to characterize the motion of individual organic molecules on the Si(100)- 2×1 surface. In particular, 4-methoxystyrene molecules are observed to translate laterally on the surface during UHV STM imaging. Switching between the two most favored conformations occurs on the time scale of 0.1-1 s. On the other hand, styrene molecules imaged under identical conditions are not observed to undergo lateral translations, thus suggesting that the rotational freedom of the methoxy group is enabling the apparent motion of 4-methoxystyrene. To test this hypothesis, the rotational freedom of the methoxy group was eliminated by synthesizing an analog molecule (5-vinyl-2,3-dihydrobenzofuran) where the methoxy group was covalently linked back to the aromatic ring. UHV STM studies of 5-vinyl-2,3-dihydrobenzofuran confirm the expected suppression of molecular motion. Overall, this study suggests that the motion of surface-mounted adsorbates can be controlled by engineering intramolecular rotational degrees of freedom.

Original languageEnglish
Pages (from-to)1785-1789
Number of pages5
JournalJournal of Vacuum Science and Technology B: Microelectronics and Nanometer Structures
Volume23
Issue number4
DOIs
Publication statusPublished - 2005

Fingerprint

Scanning tunneling microscopy
scanning tunneling microscopy
Ultrahigh vacuum
ultrahigh vacuum
Molecules
molecules
Adsorbates
styrenes
Conformations
Styrene
degrees of freedom
retarding
engineering
analogs
Imaging techniques
rings
room temperature
Temperature

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Surfaces and Interfaces
  • Physics and Astronomy (miscellaneous)

Cite this

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abstract = "Room temperature ultrahigh vacuum (UHV) scanning tunneling microscopy (STM) is used to characterize the motion of individual organic molecules on the Si(100)- 2×1 surface. In particular, 4-methoxystyrene molecules are observed to translate laterally on the surface during UHV STM imaging. Switching between the two most favored conformations occurs on the time scale of 0.1-1 s. On the other hand, styrene molecules imaged under identical conditions are not observed to undergo lateral translations, thus suggesting that the rotational freedom of the methoxy group is enabling the apparent motion of 4-methoxystyrene. To test this hypothesis, the rotational freedom of the methoxy group was eliminated by synthesizing an analog molecule (5-vinyl-2,3-dihydrobenzofuran) where the methoxy group was covalently linked back to the aromatic ring. UHV STM studies of 5-vinyl-2,3-dihydrobenzofuran confirm the expected suppression of molecular motion. Overall, this study suggests that the motion of surface-mounted adsorbates can be controlled by engineering intramolecular rotational degrees of freedom.",
author = "R. Basu and Tovar, {J. D.} and Hersam, {Mark C}",
year = "2005",
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AU - Tovar, J. D.

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PY - 2005

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N2 - Room temperature ultrahigh vacuum (UHV) scanning tunneling microscopy (STM) is used to characterize the motion of individual organic molecules on the Si(100)- 2×1 surface. In particular, 4-methoxystyrene molecules are observed to translate laterally on the surface during UHV STM imaging. Switching between the two most favored conformations occurs on the time scale of 0.1-1 s. On the other hand, styrene molecules imaged under identical conditions are not observed to undergo lateral translations, thus suggesting that the rotational freedom of the methoxy group is enabling the apparent motion of 4-methoxystyrene. To test this hypothesis, the rotational freedom of the methoxy group was eliminated by synthesizing an analog molecule (5-vinyl-2,3-dihydrobenzofuran) where the methoxy group was covalently linked back to the aromatic ring. UHV STM studies of 5-vinyl-2,3-dihydrobenzofuran confirm the expected suppression of molecular motion. Overall, this study suggests that the motion of surface-mounted adsorbates can be controlled by engineering intramolecular rotational degrees of freedom.

AB - Room temperature ultrahigh vacuum (UHV) scanning tunneling microscopy (STM) is used to characterize the motion of individual organic molecules on the Si(100)- 2×1 surface. In particular, 4-methoxystyrene molecules are observed to translate laterally on the surface during UHV STM imaging. Switching between the two most favored conformations occurs on the time scale of 0.1-1 s. On the other hand, styrene molecules imaged under identical conditions are not observed to undergo lateral translations, thus suggesting that the rotational freedom of the methoxy group is enabling the apparent motion of 4-methoxystyrene. To test this hypothesis, the rotational freedom of the methoxy group was eliminated by synthesizing an analog molecule (5-vinyl-2,3-dihydrobenzofuran) where the methoxy group was covalently linked back to the aromatic ring. UHV STM studies of 5-vinyl-2,3-dihydrobenzofuran confirm the expected suppression of molecular motion. Overall, this study suggests that the motion of surface-mounted adsorbates can be controlled by engineering intramolecular rotational degrees of freedom.

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