Abstract
5-Aza-2,3,7,8,12,13,17,18-octamethylporphyrin was synthesized and its basic properties were studied by means of spectrophotometric titration. Protonation of nitrogen atoms in the tetrapyrrolic macrocycle with the ethanolic sulfuric acid is found to be a two-step process. Corresponding ionization constants and the concentration ranges of existence of mono-and dicationic forms of the azaporphyrin under investigation are evaluated.
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