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Hydration of Chlorophyll a

  • K. Rangsriwatananon
  • H. Kleeberg
Conference paper

Abstract

The sorption isothermes and infrared spectra (4000–1000 cm-1) of Chlorophyll a (chl a) are compared.

Between 90 and 10 % relative humidity r.h. 1–2 H2O/chl a is present during desorption. The H2O spectra indicate the presence of two spectroscopically different H2O molecules containing free OH groups and H- bonds of intermediate strength. At low H2O contents (below 1 H2O chl a) H2O interactions are very different and strong H-bonds are formed. This H2O is desorbed only at elevated temperatures (80–100°C). During the subsequent H2O adsorption process water molecules form 2 moderately strong H-bonds with chl a. The changes in H2O interaction are reflected by the spectra of chl a in the C=O streching region as well.

The results are interpreted with respect to a cooperative influence of the magnesium-ion of chl a on the hydration.

Keywords

Acid Ethyl Ester Intermediate Strength Acetic Acid Ethyl Photochemical Energy Conversion Cooperativity Factor 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1987

Authors and Affiliations

  • K. Rangsriwatananon
    • 1
  • H. Kleeberg
    • 1
  1. 1.Fachbereich Physikalische ChemieUniversität MarburgMarburgGermany

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