Self-Assembled Chlorophyll a Systems as Studied by Californium-252 Plasma Desorption Mass Spectroscopy

Self-assembled chlorophyll a and pheophytin a systems in thin solid films have been studied by252Cf plasma desorption mass spectrometry (PDMS). The252Cf-PDMS spectra of these films show monomer cation and anion molecular ions, ions of molecular aggregates, and positive and negative ion fragmentation...

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Bibliographic Details
Published in:Proceedings of the National Academy of Sciences - PNAS 1980-04, Vol.77 (4), p.1745-1748
Main Authors: Hunt, J. E., Macfarlane, R. D., Katz, J. J., Dougherty, R. C.
Format: Article
Language:English
Subjects:
Average linear density
Chlorophylls
Dimers
Electrons
Ions
Mass spectroscopy
Material films
Monomers
Oligomers
Physical Sciences: Chemistry
Tetrachlorides
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Summary:Self-assembled chlorophyll a and pheophytin a systems in thin solid films have been studied by252Cf plasma desorption mass spectrometry (PDMS). The252Cf-PDMS spectra of these films show monomer cation and anion molecular ions, ions of molecular aggregates, and positive and negative ion fragmentation patterns arising from the loss of various aliphatic side chains from the chlorin ring. Chlorophyll a films cast from dry carbon tetrachloride solution, in which chlorophyll a is known to occur as the dimer, produced an abundant dimer ion. The highest degree of chlorophyll a self-assembly was observed in chlorophyll a films cast from n-octane solutions. Oligomer ions extending upwards in size to the heptamer were detected in this system.
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.77.4.1745