The tetraimidazolyl porphyrin (III) was prepared by reaction between 1-ethylimidazole-2-carboxaldehyde (I) and pyrrole (II) in refluxing propionic acid. Quaternization of the imidazole groups of (III) with iodoethane furnished the tetrakis-imidazolium iodide salt (IV). After complexation of porphyrin (IV) with manganese(III) acetate, its precipitation as the hexafluorophosphate salt followed by anion exchange with tetrabutylammonium chloride, furnished the title chelate pentachloride salt.