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Variable temperature 1H NMR spectroscopic studies. (A) Tetrakisporphyrin 2 at the concentration of 3.50 × 10−3 mol L−1 in toluene-d8. Highly complex sets of peaks in the aromatic region arise from the polymeric species of 2. (B) Bisporphyrin 8 at the concentration of 3.00 × 10−3 mol L−1 in toluene-d8. The broad resonances in the aromatic region result from the monomer–dimer equilibrium of 8.
