Abstract
Two zinc porphyrins with a superstructure around the ligand binding sites have been prepared and characterized by 1H NMR spectroscopy. The binding properties of amine ligands to the zinc porphyrins were analyzed by UV-Vis and 1H NMR spectroscopy. The thermodynamic parameters for ligand binding to the zinc porphyrins were estimated and compared to those of zinc porphyrins with and without the superstructure. The binding of aromatic amines to the superstructured zinc porphyrins bearing phenyl groups was found to be strong compared to the binding of butylamine to the zinc porphyrins. The enhanced binding of aromatic ligands to the zinc porphyrins was discussed in terms of the relation between ligand geometries and the superstructure.
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