Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Structures of Butylthiolate Self-Assembled Monolayers on Au(111) with Gold Adatoms

  • Received : 2011.07.11
  • Accepted : 2011.08.08
  • Published : 2011.10.20
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Abstract

A density functional theory method with the local basis set was employed to perform slab calculations to study thiolate-induced surface reconstruction structures of butylthiolates (ButS) with c($4{\times}2$) superlattice of the Au(111) surface. The slab calculations indicate that the most stable adsorption structure is the ButS-Au (adatom)-SBut complex form, which is in good agreement with the reported experiments and theoretical results for thiolates with shorter alkyl chains. The cis form of ButS-Au (adatom)-SBut motifs is preferred by 0.11 eV with respect to the trans form, and by 0.15 eV over the mixed cis-trans configurations due to the steric hindrance between adjacent butyl groups. It appears that the motif of Au adatom on the Au(111) surface is favored even for butylthiolate.

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