Observation of molecular association at liquid/liquid and solid/liquid interfaces by second harmonic generation spectroscopy

Tatsuya Uchida, Akira Yamaguchi, Tomomi Ina, Norio Teramae

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)

Abstract

Structural information on rhodamine dyes adsorbed at heptane/water and hydrophobized silica/water interfaces are obtained by in situ second harmonic generation (SHG) spectroscopy. The SHG spectra provide spectroscopic evidence that the molecular association occurs at both interfaces in a different manner depending on their interfacial coverage. At the heptane/water interface, an "in-plane associate" in which the electronic transition dipoles of each monomer are arranged parallel to one another appears as the sole species present. The number of monomer units making up this associate increases with the interfacial coverage while the tilt angle of the monomer unit is kept constant. By contrast, both a "sandwich dimer" and the in-plane associate are observed at the hydrophobized silica/water interface with increasing interfacial coverage. These results successfully demonstrate differences in adsorption behavior and molecular association between liquid/liquid and solid/ liquid interfaces.

Original languageEnglish
Pages (from-to)12093-12094
Number of pages2
JournalJournal of Physical Chemistry B
Volume104
Issue number51
Publication statusPublished - 2000 Dec 28

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Engineering(all)

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