Collect. Czech. Chem. Commun. 1989, 54, 1630-1639

Photochemical generation of porphyrin. ESR and absorption spectroscopic studies

Pavel Stopka and Dana M. Wagnerová

Institute of Inorganic Chemistry, Czechoslovak Academy of Sciences, 160 00 Prague 6


Irradiation by a high-pressure mercury arc of a mixture containing pyrrole, benzaldehyde, and Fe(III) in the medium of glacial acetic acid results in the formation of Fe(III)-meso-tetraphenylporphyrin and some amount of free meso-tetraphenylporphyrin. The products were identified by means of ESR and absorption spectra. When irradiated for long periods of time, the products undergo photochemical degradation. Since the photochemical incorporation of Fe(III) into the free meso-tetraphenylporphyrin ligand yields a complex with a structure different from that in the previous case, it may be concluded that Fe(III) acts as a template in laboratory synthesis from the above starting substances.