A simple method to prepare porphyrin “wheels” on a micrometer scale is described. It is possible to arrange several types of porphyrin derivatives, including Protoporphyrin IX and Chlorophyll- a, in the form of rings using this method. A mechanism for the formation of these types of assemblies is proposed that is based on the generation of “2D-gas bubbles” which induces aggregation of the porphyrin molecules.
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Schenning et al. (1996) studied this question.