FAR‐INFRARED SPECTRA OF LANGMUIR‐BLODGETT FILMS OF CHLOROPHYLL a, CHLOROPHYLL b, PHEOPHYTIN a and THEIR ADDUCTS WITH WATER and DIOXANE

Heidar‐Ali ‐A Tajmir‐Riahi, Gongming Wang, Roger Leblanc

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

Fourier transform infrared spectra in the low frequency region (500–150cm−1) of Langmuir‐Blodgett films of chlorophyll a (Chi a), chlorophyll b (Chi b) and pheophytin a have been studied. Correlations between spectral changes in monolayer and multilayers of Chi a and Chi b and their adducts with water and dioxane have been established. Spectroscopic evidence has indicated that, although there are no individual absorption bands that can be assigned to pure Mg‐nitrogen and/or Mg‐oxygen stretching or bending modes, there are several bands in the400–200 cm−1 region of the spectra containing considerable contributions from metal‐nitrogen and metal‐oxygen vibrational modes. These specific vibrations exhibit marked intensity changes and shifts upon water and dioxane interaction. The different states of chlorophyll aggregation in Langmuir‐Blodgett mono‐ and multilayers films resulted in noticeable changes in their far‐IR spectra.

Original languageEnglish (US)
Pages (from-to)265-271
Number of pages7
JournalPhotochemistry and Photobiology
Volume54
Issue number2
DOIs
StatePublished - 1991
Externally publishedYes

ASJC Scopus subject areas

  • Medicine(all)
  • Biochemistry
  • Physical and Theoretical Chemistry

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