Record Display for the EPA National Library Catalog

RECORD NUMBER: 49 OF 70

Main Title Photochemical Reduction of Zn-Etioporphyrin in Frozen Solutions; Structure of Reduced Forms (Fotokhimicheskoe Vosstanovlenie Zn-Etioporfirina v Zamorozhennykh Rastvorakh. Struktura Vosstanovlennykh Form).
Author Sidorov., A. N. ;
CORP Author Environmental Protection Agency, Research Triangle Park, N.C. Translation Services Section.
Year Published 1973
Report Number EPA-TR-74-35;
Stock Number PB-259 681-T
Additional Subjects Photochemical reactions ; Metal complexes ; Porphyrins ; Zinc organic compounds ; Solutions ; Spectrochemical analysis ; Thermochemistry ; Low temperature research ; Molecular structures ; Reduction(Chemistry) ; Translations ; USSR ; Etioporphyrins
Holdings
Library Call Number Additional Info Location Last
Modified		 Checkout
Status
NTIS  PB-259 681-T Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 12p
Abstract
It has been found that solutions of Zn-etioporphyrin in N-containing organic bases (lutidine, N-methylpiperidine, triethylamine), frozen at -196C, are capable of photochemical conversions. Comparison of the properties and spectral characteristics of the photoproducts formed with properties of protonated Zn-etioporphyrin dianions, produced by chemical methods, permits the following scheme to be proposed for conversion of Zn-etioporphyrin in organic bases (P, Zn-etioporphyrin molecule; D, molecule of base, which is both an electron donor and a proton donor to the P molecule). The first stage observable spectrally is photoreduction in the frozen solution. The hydroderivative formed in frozen solution is capable of again splitting off a proton during irradiation. Thermal addition of a proton to the PH(-) and its subsequent photocleavage in frozen solution can be reproduced repeatedly in one and the same sample. The central metal atom has a significant effect on the photochemical behavior of a methyl-porphyrin in solution.