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Self-assembled chlorophylla and pheophytina systems in thin solid films have been studied by252 Cf plasma desorption mass spectrometry (PDMS). The252 Cf-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. Chlorophylla films cast from dry carbon tetrachloride solution, in which chlorophylla is known to occur as the dimer, produced an abundant dimer ion. The highest degree of chlorophylla self-assembly was observed in chlorophylla films cast fromn -octane solutions. Oligomer ions extending upwards in size to the heptamer were detected in this system.

Self-assembled chlorophyll a systems as studied by californium-252 plasma desorption mass spectroscopy