Thermal Behavior of one-layer Langmuir-Blodgett films of 2-pentadecyl-7,7,8,8-tetracyanoquinodimethane studied by ultraviolet-visible and infrared spectroscopies

Shin Ichi Morita, Katsuhiro Nichogi, Yukihiro Ozaki

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Thermal Behavior of one-layer Langmuir-Blodgett (LB) films of 2-pentadecyl-7,7,8,8-tetracyanoquinodimethane (pentadecyl-TCNQ) has been investigated by use of infrared (IR) and ultraviolet-visible (UV-Vis) spectroscopies. An IR transmission spectrum of the film shows gradual temperature-dependent changes below the melting point of the film, and then gives dramatic spectral changes near the melting point. Temperature-dependent UV-Vis spectral changes of the film indicate that the morphological changes occur in domains of the film, and that absorption bands in the 320-560 nm region arising from the π-π* transition of the chromophore consist of at least three components due to different forms of chromophore aggregation. More active state of the alkyl-chain, hexagonal state, seems to be a trigger for the morphological changes in the domains.

Original languageEnglish
Pages (from-to)325-328
Number of pages4
JournalMolecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals
Volume337
DOIs
Publication statusPublished - 1999 Jan 1
Externally publishedYes

Keywords

  • Infrared spectroscopy
  • Langmuir-Blodgett films
  • Tetracyanoquinodimethane
  • Thermal behavior

ASJC Scopus subject areas

  • Condensed Matter Physics

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