Optically induced band shifts in infrared spectra of mixed self-assembled monolayers of biphenyl thiols

Jung F. Kang, Abraham Ulman, Rainer Jordan, Dirk G. Kurth

Research output: Contribution to journalArticlepeer-review

Abstract

Optically induced band shifts in reflection absorption infrared spectra (RAIR) of mixed self-assembled monolayers (SAMs) are reported. SAMs of 4-trifluoromethyl-4- mercaptobiphenyl dispersed in 4′-methyl-4-mercaptobiphenyl on gold exhibit significant shifts of the spectral envelope of the symmetric CF3 stretch and the b1u skeletal mode. A linear relationship is observed between the band positions, the band intensity, and the surface CF3 group concentration. To rationalize the observed changes in band positions and shapes, a classical electromagnetic theory approach is used, providing an excellent agreement between theory and experiments. The simplified RAIR signature of 4′-trifluoromethyl-4-mercaptobiphenyl on gold is a unique example of the surface selection rule.

Original languageEnglish (US)
Pages (from-to)5555-5559
Number of pages5
JournalLangmuir
Volume15
Issue number17
DOIs
StatePublished - Aug 17 1999

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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