Spectra and Structure of the Photoreduced Forms of Porphyrins in an Acid Medium (Spektry I Struktura Fotovosstanovlennykh Form Porfirinov V Kisloi Srede)

摘要

The existence of three types of photoreduced forms of porphyrine dications which are di-, tetra-, and hexahydroderivatives of initial porphirine dication is possible. Hydroderivatives of porphirine dication can be obtained both, by photochemical reduction in acid medium in the presence of reagent-restorer and by transfering neutral molecules of porphyrines photoreduced forms into the acid medium. Di- and tetrahydroderivatives of porphyrine dication have specific absorption bands about 450 and 500 milli microns correspondingly. Hexahydroderivatives have no bands in the visible region. The analogy of spectral characteristics of the reduced forms of porphyrine dication and of metall porphyrine is the evidence of the similarity of their molecular structures. (Author)