Fluorescence studies of Langmuir-Blodgett films of chlorophyll a mixed with phytol

Bogumil Zelent, Gaétan Munger, Anouk Helluy, Roger Leblanc

Research output: Contribution to journalArticle

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Abstract

The fluorescence properties of chlorophyll a mixed with phytol (in a 1:100 molar ratio) were studied in Langmuir-Blodgett films. Fluorescence excitation and fluorescence emission spectra of the chlorophyll a-phytol system in Langmuir-Blodgett films, prepared from an argon-saturated subphase, have maxima at 444 nm and 684 nm respectively. Two lifetime components describe the state of chlorophyll a in Langmuir-Blodgett films: τ1 = 5.18 ns (33%) and τ2 = 1.83 ns (67%); these are assigned to single molecules of chlorophyll a and to hydrated dimers or oligomers of chlorophyll a respectively. For films prepared from an oxygen-saturated subphase, the maxima of the fluorescence excitation and fluorescence emission spectra of the chlorophyll a-phytol system are shifted to 423 nm and 678 nm respectively. The lifetime components in the time-resolved fluorescence decay curve of the film are τ1 = 3.81 ns (54%) and τ2 = 1.56 ns (46%). The observed changes in the fluorescence parameters of the chlorophyll a-phytol Langmuir-Blodgett films are discussed in view of the chemical effect of molecular oxygen on the mixed chlorophyll a-phytol monolayer at the air-water interface.

Original languageEnglish
Pages (from-to)373-381
Number of pages9
JournalJournal of Photochemistry and Photobiology, A: Chemistry
Volume57
Issue number1-3
DOIs
StatePublished - Apr 10 1991
Externally publishedYes

Fingerprint

Phytol
Langmuir Blodgett films
chlorophylls
Chlorophyll
Langmuir-Blodgett films
Fluorescence
fluorescence
emission spectra
life (durability)
chemical effects
chlorophyll a
Molecular oxygen
Argon
oxygen
oligomers
Oligomers
Dimers
excitation
Monolayers
dimers

ASJC Scopus subject areas

  • Bioengineering
  • Physical and Theoretical Chemistry

Cite this

Fluorescence studies of Langmuir-Blodgett films of chlorophyll a mixed with phytol. / Zelent, Bogumil; Munger, Gaétan; Helluy, Anouk; Leblanc, Roger.

In: Journal of Photochemistry and Photobiology, A: Chemistry, Vol. 57, No. 1-3, 10.04.1991, p. 373-381.

Research output: Contribution to journalArticle

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