N.m.r. spectroscopy is used to demonstrate that the predominant interaction in aggregations of magnesium(II) porphyrins [e.g.(1)] involves the metal atom in one molecule and the propionate carbonyl group in another; in contradistinction, the similarly strong aggregation observed for the first time in zinc(II) porphyrins [e.g.(2)] is shown to be independent of a metal to side-chain interaction.
R. J. Abraham, F. Eivazi, H. Pearson and K. M. Smith, J. Chem. Soc., Chem. Commun., 1976, 698 DOI: 10.1039/C39760000698
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