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FAR‐INFRARED SPECTRA OF LANGMUIR‐BLODGETT FILMS OF CHLOROPHYLL a, CHLOROPHYLL b, PHEOPHYTIN a and THEIR ADDUCTS WITH WATER and DIOXANE *
Author(s) -
TajmirRiahi HeidarAli,
Wang Gongming,
Leblanc Roger M.
Publication year - 1991
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1991.tb02015.x
Subject(s) - pheophytin , chemistry , monolayer , langmuir–blodgett film , analytical chemistry (journal) , infrared spectroscopy , chlorophyll , chlorophyll a , infrared , spectral line , absorption (acoustics) , photochemistry , fourier transform infrared spectroscopy , materials science , organic chemistry , optics , photosystem ii , biochemistry , photosynthesis , physics , astronomy , composite material
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.