PHOTOCHEMICAL AND SPECTRAL PROPERTIES OF CHLOROPHYLLIN.
POLYTECHNIC INST OF BROOKLYN N Y INST OF POLYMER RESEARCH
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The infrared and visible absorption spectra and the fluorescence spectra of chlorophyllin a were determined, and compared with those of chlorophyll a. The infrared spectra showed the absence of a carbonyl group except when chlorophyllin b was present as an impurity. This provides the basis of a convient method of analysis of the chlorophyll b content of a given chlorophyll preparation. The visible absorption spectrum of cholorophyllin a has features in common with that of chlorophyll a. In particular, the formation of colloidal aggregates is shown by the appearance of an absorption band at 735 mu just as is observed for micro-crystals of chlorophyll a. The appearance of a pronounced absorption maximum at 688 mu attributed to dimer formation is analogous to that observed by difference spectra in the case of concentrated solutions of chlorophyll a. In stretched polymer films chlorophyllin a and chlorophyll a exhibit a positive dichroism which is greater for the blue absorption maximum than for the red. Author