Preparation and Properties of Monomolecular Films of Chlorophyllaand Pheophytina
| Autor: | A. G. Tweet, G. L. Gaines, W. D. Bellamy |
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| Rok vydání: | 1963 |
| Předmět: |
Pheophytin
Chlorophyll a Aqueous solution Absorption spectroscopy Analytical chemistry General Physics and Astronomy Photochemistry Pigment chemistry.chemical_compound chemistry visual_art Chlorophyll Monolayer visual_art.visual_art_medium sense organs Physical and Theoretical Chemistry Chemical decomposition |
| Zdroj: | The Journal of Chemical Physics. 39:2528-2538 |
| ISSN: | 1089-7690 0021-9606 |
| DOI: | 10.1063/1.1734057 |
| Popis: | Monomolecular films of chlorophyll a and pheophytin a on aqueous subphases have been prepared and studied. The preparation and preservation of these pigments in a state of high purity has required procedural refinements which are described. Chemical degradation in solution and in the monolayer can be prevented by appropriate precautions. At surface pressures below 22 dyn/cm for chlorophyll and 10 dyn/cm for pheophytin, the films on pH 8.0 buffer are mechanically stable in the dark at 20°C. At these pressures, there is little difference in the force—area curves of chlorophyll and pheophytin, although the surface potentials and surface dipole moments of the two pigments are markedly different. The visible absorption spectrum of the pigment monolayers on the aqueous subphase is rapidly altered by illumination, although under optimum conditions it shows little change in the dark over periods of several hours. These experiments were performed with a monolayer spectrometer, which permits measurements of the abs... |
| Databáze: | OpenAIRE |
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