Metalloporphyrins not carrying functional groups and the π‐radicals of these species form comparably stable coplanar π‐π‐dimers by means of various types of weak interactions. Chlorophyll a and other derivatives containing carbonyl groups add water and aggregate into molecular complexes by means of hydrogen bonds. Such aggregates are of special interest in connection with a new hypothesis for the photo‐oxidation of water to oxygen during photosynthesis. Finally, Some new discoveries concerning the structure and reactivity of heme‐oxygen complexes are discussed.
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Jürgen‐Hinrich Fuhrhop (1976) studied this question.
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