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How adsorbate alignment leads to selective reaction.

Fang Cheng1, Wei Ji, Lydie Leung

  • 1Lash Miller Chemical Laboratories, Department of Chemistry and Institute of Optical Sciences, University of Toronto , Toronto, Ontario M5S 3H6, Canada .

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|August 8, 2014
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Summary
This summary is machine-generated.

Adsorbate alignment significantly impacts electron-induced reactions on asymmetric surfaces. The orientation of meta-iodopyridine on copper determined whether the resulting pyridyl fragment bonded vertically or horizontally, influencing surface reaction outcomes.

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Area of Science:

  • Surface Science
  • Chemical Physics
  • Materials Science

Background:

  • Adsorbate alignment is crucial for surface reactions.
  • Asymmetric metal surfaces present unique reaction pathways.
  • Electron-induced reactions offer control over surface chemistry.

Purpose of the Study:

  • Investigate the role of adsorbate alignment in electron-induced reactions.
  • Determine how molecular orientation affects product binding on Cu(110).
  • Understand the mechanism of dissociative attachment for meta-iodopyridine.

Main Methods:

  • Scanning Tunneling Microscopy (STM) to visualize adsorbate orientation and product binding.
  • Electron-induced dissociative attachment experiments.
  • Impulsive two-state dynamical modeling to explain reaction outcomes.

Main Results:

  • Meta-iodopyridine physisorbed with C-I bond either along (A) or perpendicular (P) to Cu(110) rows.
  • Alignment along 'A' resulted in vertical, singly bound pyridyl.
  • Alignment along 'P' resulted in horizontal, doubly bound pyridyl.

Conclusions:

  • Surface atomic spacing on asymmetric Cu(110) dictates product binding modes.
  • The 'A' orientation accommodates single binding site, while 'P' allows dual binding.
  • STM and dynamical modeling elucidate the influence of surface alignment on reaction outcomes.