Synthesis and Basic Properties of 5-Aza-2,3,7,8,12,13,17,18-octamethylporphyrin

摘要

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.