Abstract
Abstract— Fourier‐transform (FT) infrared (IR) absorption spectra have been measured for chlorophyll a (Chi a), chlorophyll b (Chi b), pheophytin a (Pheo a), and pheophytin b (Pheo b) in highly dilute (10‐5‐10‐6M) water‐saturated carbon tetrachloride solutions. Frequencies of IR bands due to C=O stretching modes of the 9‐keto group indicate that Chi a assumes largely a dimeric structure in the concentrated (10‐2‐10‐3M) water‐saturated carbon tetrachloride solutions but it remains mostly a monomer with one or two coordinated water molecules in dilute (10‐5‐10‐6M) solutions. Although it seems that Chi b also assumes predominantly dimeric form in concentrated solutions and monomelic form in dilute solutions, the relative intensity change of two C=O stretching bands ascribed to the free and coordinated 3‐aldehyde groups with decreasing concentration suggests that the aldehyde group is also involved in formation of the dimer. The relative intensity of two C=O stretching bands due to the free and coordinated aldehyde groups changes significantly for Pheo b in water‐saturated carbon tetrachloride solutions. This observation suggests that some of Pheo b also assume dimeric form via the aldehyde group in concentrated solutions.
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