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In this study, different basicity of the pyridyl substituents of meso-tetra(pyridyl)porphyrins and the substituents of the common impurities associated with the synthesis of the porphyrins has been utilized to improve and simplify the purification of these porphyrins. Also, diprotonation of meso-tetraarylporphyrins with weak or strong acids and the associated shifts of the Soret and Q(0,0) bands have been used for the spectrophotometric detection of trace to substantial amounts of unreacted porphyrin upon complexation of porphyrins with iron and manganese.

Facile Purification of meso-Tetra(pyridyl)­porphyrins and Detection of Unreacted Porphyrin upon Metallation of meso-Tetra(aryl) porphyrins

Facile Purification of meso-Tetra(pyridyl)porphyrins and Detection of Unreacted Porphyrin upon Metallation of meso-Tetra(aryl) porphyrins