Packing and molecular orientation of alkanethiol monolayers on gold surfaces

Abraham Ulman, James E. Eilers, Nolan Tillman

Research output: Contribution to journalArticle

Abstract

Preliminary calculations based on a simple model give a good description of the molecular orientation and packing of alkanethiol monolayers on gold surfaces. These calculations suggest that alkanethiol molecules on gold have a total alkyl chain axis tilt of approximately 38° in a plane that bisects the methylene H-C-H angles, followed by a rotation about the alkyl chain axis of ≈46°. The alkyl chain tilt is a function of the sulfur-sulfur spacing in a hexagonal crystal lattice layer and maximizes the attractive interactions between neighboring molecules. These results are in agreement with the molecular orientations obtained from grazing angle FTIR experiments on dodecanethiol monolayers on a (111) gold surface.

Original languageEnglish (US)
Pages (from-to)1147-1152
Number of pages6
JournalLangmuir
Volume5
Issue number5
StatePublished - 1989

Fingerprint

Molecular orientation
Gold
Monolayers
gold
Sulfur
sulfur
Molecules
grazing
methylene
crystal lattices
Crystal lattices
molecules
spacing
Experiments
interactions

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this

Packing and molecular orientation of alkanethiol monolayers on gold surfaces. / Ulman, Abraham; Eilers, James E.; Tillman, Nolan.

In: Langmuir, Vol. 5, No. 5, 1989, p. 1147-1152.

Research output: Contribution to journalArticle

Ulman, A, Eilers, JE & Tillman, N 1989, 'Packing and molecular orientation of alkanethiol monolayers on gold surfaces', Langmuir, vol. 5, no. 5, pp. 1147-1152.
Ulman, Abraham ; Eilers, James E. ; Tillman, Nolan. / Packing and molecular orientation of alkanethiol monolayers on gold surfaces. In: Langmuir. 1989 ; Vol. 5, No. 5. pp. 1147-1152.
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