Structure of mercaptobiphenyl monolayers on mercury

Lilach Tamam, Henning Kraack, Eli Sloutskin, Benjamin M. Ocko, Peter S. Pershan, Abraham Ulman, Moshe Deutsch

Research output: Contribution to journalArticle

Abstract

The molecular-scale structure and phase behavior of single-component Langmuir films of 4′-methyl-4-mercaptobiphenyl (MMB) and 4′-perfluoromethyl-4-mercaptobiphenyl (FMMB) on mercury were studied using surface tensiometry, grazing incidence X-ray diffraction, and X-ray reflectivity. At low coverages, a condensed but in-plane disordered single layer of surface-parallel molecules is found for both compounds. At high coverages, both compounds exhibit in-plane-ordered phases of standing-up molecules. For MMB, the biphenyl core dominates the structure, yielding a centered-rectangular unit cell with an area A x of 21.8 Å 2/molecule, with molecules tilted by ∼14° from the surface normal in the nearest-neighbor direction, and a coherence length ξ of > 1000 Å for the crystalline domains. For FMMB, the perfluoromethyl group dominates the structure, yielding a hexagonal unit cell with untilted molecules, an area A x of 24.2 Å 2/molecule, and a much smaller ξ of ∼110 Å. The structure is discussed in comparison with self-assembled monolayers of MMB on crystalline Au(111) and similar-length alkanethiolate SAMs on Au(111) and on mercury. The differences in the structure are discussed and traced to the differences in the substrate's surface structure, and in the molecular cross section and rigidity.

Original languageEnglish (US)
Pages (from-to)12534-12543
Number of pages10
JournalJournal of Physical Chemistry B
Volume109
Issue number25
DOIs
StatePublished - Jun 30 2005

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Mercury
Monolayers
Molecules
molecules
Crystalline materials
Langmuir Blodgett films
Self assembled monolayers
Phase behavior
cells
grazing incidence
rigidity
Surface structure
Rigidity
x rays
reflectance
X ray diffraction
X rays
cross sections
Substrates
diffraction

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Tamam, L., Kraack, H., Sloutskin, E., Ocko, B. M., Pershan, P. S., Ulman, A., & Deutsch, M. (2005). Structure of mercaptobiphenyl monolayers on mercury. Journal of Physical Chemistry B, 109(25), 12534-12543. https://doi.org/10.1021/jp050278j

Structure of mercaptobiphenyl monolayers on mercury. / Tamam, Lilach; Kraack, Henning; Sloutskin, Eli; Ocko, Benjamin M.; Pershan, Peter S.; Ulman, Abraham; Deutsch, Moshe.

In: Journal of Physical Chemistry B, Vol. 109, No. 25, 30.06.2005, p. 12534-12543.

Research output: Contribution to journalArticle

Tamam, L, Kraack, H, Sloutskin, E, Ocko, BM, Pershan, PS, Ulman, A & Deutsch, M 2005, 'Structure of mercaptobiphenyl monolayers on mercury', Journal of Physical Chemistry B, vol. 109, no. 25, pp. 12534-12543. https://doi.org/10.1021/jp050278j
Tamam L, Kraack H, Sloutskin E, Ocko BM, Pershan PS, Ulman A et al. Structure of mercaptobiphenyl monolayers on mercury. Journal of Physical Chemistry B. 2005 Jun 30;109(25):12534-12543. https://doi.org/10.1021/jp050278j
Tamam, Lilach ; Kraack, Henning ; Sloutskin, Eli ; Ocko, Benjamin M. ; Pershan, Peter S. ; Ulman, Abraham ; Deutsch, Moshe. / Structure of mercaptobiphenyl monolayers on mercury. In: Journal of Physical Chemistry B. 2005 ; Vol. 109, No. 25. pp. 12534-12543.
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