Abstract
The basic properties of 5,10,15,20-tetra(4-chlorophenyl)porphyrin in the acetonitrile-perchloric acid system at standard temperature were studied by spectrophotometric titration. The protonation of nitrogen atoms of the tetrapyrrole macrocycle was found to proceed in two steps to give mono- and diprotonated species. The corresponding ionization constants and concentration ranges were determined. Diprotonated porphyrin binds efficiently iodide ions; the stability constants of the 1: 1 and 1: 2 complexes thus formed were determined.
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