The kinetics of the acid solvolysis reactions of twelve water-soluble lanthanide tetrakis(N-methyl-4-pyridyl)porphyrins (Ln–P) follow rate =k1[Ln–P][H+]2/{(k–1/k2)+[H+]} at 25 °C, l= 0.8 M(LiNO3/HNO3) indicating that two protons are required for solvolysis, and since log (k1k2/k–1)= 45.0R0– 39.4 (R0 is the ionic radius in Å), a 0.1 Å change in radius has a 32 000 fold rate effect.
S. Haye and P. Hambright, J. Chem. Soc., Chem. Commun., 1988, 666 DOI: 10.1039/C39880000666
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