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Dodecasubstituted porphyrins are so-called highly substituted porphyrins which are often nonplanar, i.e. they do have a highly distorted macrocycle structure. Taking a large "sitting-atop" metal ion, such as thallium(III), results in a reflattening of the macrocycle. Thus, metal effects can counteract the macrocycle distortion imposed via steric hindrance of peripheral substituents.

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This page is a summary of: Prevention of out-of-plane macrocycle distortion by thallium in the sterically strained 2,3,7,8,12,13,17,18-octaethyl-5,10,15,20-tetranitroporphyrin, Journal of the Chemical Society Dalton Transactions, January 1993, Royal Society of Chemistry,
DOI: 10.1039/dt9930003539.
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