A Spectropotentiometric Study of Association Equilibria of Cationic Acids of Mesoporphyrin IX Dimethyl Ester with Iodide Ions in Acetonitrile

摘要

The association equilibrium of porphyrinium ions of mesoporphyrin IX dimethyl ester (H_2MP) with iodide ions in acetonitrile was studied by spectropotentiometric titration. Two associates were revealed: (H_4MP~2+)(I~-) and (H_4MP~(2+))(I~-)_2; the electronic absorption spectra of these species were measured, and their formation constants were determined.