Mixed self-assembled monolayers of rigid biphenyl thiols: Impact of solvent and dipole moment

Jung F. Kang, Sheng Liao, Rainer Jordan, Abraham Ulman

Research output: Contribution to journalArticle

Abstract

The formation of mixed self-assembled monolayers (SAMs) of different 4'- substituted-4-mercaptobiphenyl (with X = CH3, CF3, and SCH3) on gold, from different solvents, has been investigated. Monolayer thickness values, estimated by ellipsometry, contact angle measurements, and external reflection absorption infrared (ERFTIR) spectroscopy confirms that > 90% of the monolayer is formed after 1 h of adsorption. The dielectric constant of the solvent, the permanent dipole moment of the substituted mercaptobiphenyl, their adsorption and desorption kinetics, and their intermolecular dipole- dipole interactions in the SAM were all found to play a crucial role in the final composition of the mixed SAMs.

Original languageEnglish (US)
Pages (from-to)9662-9667
Number of pages6
JournalJournal of the American Chemical Society
Volume120
Issue number37
DOIs
StatePublished - Sep 23 1998

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ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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