1,2-dichloroethane on Cu(100) and oxygen-covered Cu(100): Conformation, orientation, and transformation

Kuan Huang Kuo, Yi Shiue Lin, Jain Jung Shih, Yung Hsuan Liao, Jian Shiun Lin, Che Ming Yang, Jong-Liang Lin

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Temperature-programmed reaction/desorption, reflection-absorption infrared spectroscopy, and density functional theory calculations have been employed to investigate the adsorption of ClCH2CH2Cl on Cu(100) and O/Cu(100) in the subjects of identification of the rotational isomers, adsorption energy, adsorption geometry, thermal stability of the layer structure, and transformation between the trans and gauche conformers. On Cu(100), both the trans and gauche forms of ClCH2CH2Cl coexist on the surface at a monolayer coverage, and their thermal desorption peak appears at 187 K. The trans molecules are likely adsorbed with the C-Cl bonds approximately parallel to the surface. On O/Cu(100), the gauche conformer is the predominant species and the desorption temperature is shifted to 199 K. It is found that the ClCH2CH2Cl layer structure on Cu(100), up to a ∼15 monolayer coverage studied, is stable between 120-140 K. However, O/Cu(100) shows an interesting contrast. The thermal stability only appears at a coverage below ~3 monolayers. The transformation from gauche to trans takes place for higher coverages. On the basis of the cluster-model calculations without consideration of the interaction between adsorbed molecules, it is shown that the activation energy for the transformation between trans and gauche ClCH2CH2Cl on O/Cu(100) is much lower than that on Cu(100), suggesting that the trans molecules are easier to be transformed into gauche ones on O/Cu(100), as they are adsorbed on the proximity of preadsorbed oxygen atoms.

Original languageEnglish
Pages (from-to)7757-7764
Number of pages8
JournalJournal of Physical Chemistry C
Volume111
Issue number21
DOIs
Publication statusPublished - 2007 May 31

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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