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- Title
Basic properties of porphyrins with polyethylenoxide spacers of various length.
- Authors
Churakhina, Yu. I.; Ivanova, Yu. B.; Mal'tseva, O. V.; Mamardashvili, N. Zh.
- Abstract
Basic properties of bis[5-(3-oxyphenyl)-2,8,12,18-tetrabutyl-3,7,13,17-tetramethylporphyrinyl]-3,6,9-trioxyundecane-1,11 and bis[5-(3-oxyphenyl)-2,8,12,18-tetrabutyl-3,7,13,17-tetramethylporphyrinyl]-3,6,9,12-tetraoxytetradecane-1,14 were studied by the spectrophotometric titration in ethanol-sulfuric acid system at 298 K. It was established that protonation of nitrogen atoms in tetrapyrrole fragments of dimeric porphyrins proceeds in two steps. The corresponding ionization constants and the concentration limits of existence of di- and tetracationic forms of the compounds under study were evaluated.
- Subjects
PORPHYRINS; IONIZATION constants; VOLUMETRIC analysis; SULFURIC acid; POLYETHYLENE oxide; PROTON transfer reactions; SPECTROPHOTOMETRY
- Publication
Russian Journal of General Chemistry, 2009, Vol 79, Issue 11, p2435
- ISSN
1070-3632
- Publication type
Article
- DOI
10.1134/S1070363209110255