Abstract

The porphyrin iron complexes, such as hemoglobin, mioglobin, citochromes, are important components of nature involved in various biological processes. The Fe(III) porphyrins dissolved in water interact with water molecules, OH⁻, H⁺ and other compounds in solution. Due to this interaction Fe (III) complexes of porphyrins are present in aqueous solutions in equilibrium of various forms with different spectral, energetic and paramagnetic characteristics, and spatial structure, as well. The equilibrium depends on external conditions, such as pH, ionic strength, the concentration of foreign molecules, and on the structure and charge of the porphyrin molecule [1]. Thus the characteristics of a system should depend on these conditions and therefore a detailed study of the equilibrium is important.

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