Second-harmonic probe of pressure-induced structure ordering within long-chain fluorescein monolayer at the air/water interface

Valeria Tsukanova, Akira Harata, Teiichiro Ogawa

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Pressure-induced structure ordering of long-chain Fluorescein O322 molecules within the monolayer at the air/water interface was studied by rotating a sample trough using the second-harmonic generation technique. Azimuthal angle dependences of the polarized second-harmonic intensity (Ipp, Ips, Iss, and Isp) were measured for different degrees of monolayer compression. Ipp and Iss showed a 2-fold pattern, whereas Ips and Isp showed a 4-fold pattern. A set of theoretical equations was derived to interpret the observed pattern. The observed patterns agreed with the equations based on C2v symmetry, and the monolayer showed a definite crystalline structure in the 0.21 nm2/molecule region. These results showed that the transition of an initially disordered and heterogeneous dye monolayer into a fairly regular crystalline-like structure was characterized by continuous changes in the structure ordering of constituent molecules maintaining C2v symmetry.

Original languageEnglish
Pages (from-to)7707-7712
Number of pages6
JournalJournal of Physical Chemistry B
Volume104
Issue number32
DOIs
Publication statusPublished - Aug 17 2000
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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