Molecular Engineering

, Volume 1, Issue 3, pp 191–204 | Cite as

Second-harmonic generation in monolayers of hemicyanine dyes at the air/water interface: Observation of chemical degradation

  • G. Gillberg
  • R. Keosian
  • J. L. Pruksarnukul
  • D. W. Lupo
Article

Abstract

In situ studies of second-harmonic generation (SHG) in monolayers of pure hemicyanine dyes and their mixtures with arachidic acid at the air/water interface were performed. The studies revealed an unexpected chemical instability of the hemicyanine dyes involving a cleavage of the stilbene double bond when deposited onto the water surface. This reaction occurred especially rapidly in the presence of the arachidic acid. Dilution with arachidic acid did not lead to a significant enhancement of the harmonic intensity.

Key words

L-B film second harmonic generation hemicyanine dyes chemical stability 

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Copyright information

© Kluwer Academic Publishers 1991

Authors and Affiliations

  • G. Gillberg
    • 1
  • R. Keosian
    • 1
  • J. L. Pruksarnukul
    • 1
  • D. W. Lupo
    • 2
  1. 1.Hoechst Celanese CorporationSummitU.S.A.
  2. 2.Hoechst AGFrankfurt am Main 80F.R.G.

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