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 journalArticle

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

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Infrared absorption
Self assembled monolayers
Sulfhydryl Compounds
thiols
Gold
infrared spectra
Infrared radiation
shift
gold
absorption spectra
envelopes
Experiments
signatures
electromagnetism
diphenyl

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this

Optically induced band shifts in infrared spectra of mixed self-assembled monolayers of biphenyl thiols. / Kang, Jung F.; Ulman, Abraham; Jordan, Rainer; Kurth, Dirk G.

In: Langmuir, Vol. 15, No. 17, 17.08.1999, p. 5555-5559.

Research output: Contribution to journalArticle

Kang, Jung F. ; Ulman, Abraham ; Jordan, Rainer ; Kurth, Dirk G. / Optically induced band shifts in infrared spectra of mixed self-assembled monolayers of biphenyl thiols. In: Langmuir. 1999 ; Vol. 15, No. 17. pp. 5555-5559.
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