TY - JOUR
T1 - FAR‐INFRARED SPECTRA OF LANGMUIR‐BLODGETT FILMS OF CHLOROPHYLL a, CHLOROPHYLL b, PHEOPHYTIN a and THEIR ADDUCTS WITH WATER and DIOXANE
AU - Tajmir‐Riahi, Heidar‐Ali ‐A
AU - Wang, Gongming
AU - Leblanc, Roger M.
PY - 1991/8
Y1 - 1991/8
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84989741981&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84989741981&partnerID=8YFLogxK
U2 - 10.1111/j.1751-1097.1991.tb02015.x
DO - 10.1111/j.1751-1097.1991.tb02015.x
M3 - Article
AN - SCOPUS:84989741981
VL - 54
SP - 265
EP - 271
JO - Photochemistry and Photobiology
JF - Photochemistry and Photobiology
SN - 0031-8655
IS - 2
ER -