Intermolecular complexes between several metal porphyrins and series of both conventional acceptors and donors have been studied in organic solvents. The stability constants and absorption spectra of the complexes have been measured. It is suggested that one of the factors contributing to stability is the matching of the sizes of the porphyrin and the donor or acceptor, but that this is not always dominant.
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Hill et al. (1969) studied this question.