Kinetics of complex formation of 5,10,15,20-tetraphenylporphyrin and 2,3,7,8,12,13,17,18-octaethylporphyrin with iron valinate, guaninate, and adeninate
- Authors: Zaitseva S.V.1, Zdanovich S.A.1, Koifman O.I.1,2
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Affiliations:
- Krestov Institute of Solution Chemistry
- Ivanovo State University of Chemical Technology
- Issue: Vol 86, No 12 (2016)
- Pages: 2653-2659
- Section: Article
- URL: https://journals.rcsi.science/1070-3632/article/view/216712
- DOI: https://doi.org/10.1134/S1070363216120136
- ID: 216712
Cite item
Abstract
The complex formation of 5,10,15,20-tetraethyl-porphyrin and 2,3,7,8,12,13,17,18-octaethylporphyrin with iron(III) valinate and iron(II) guaninate and adeninate in DMSO was studied by spectrophotometry. Kinetic parameters were estimated and a possible reaction mechanism was proposed. The nature of the macrocyclic ligand and salt were shown to affect the reaction kinetics. The complex formation was found to be hindered by shielding of the iron cation by the nitrogenous base and amino acid fragments. Quantum-chemical calculations by the PM3 method were used to obtain geometric characteristics of the reagents and reaction products. The calculation results showed that the formation of iron porphyrinates is accompanied by a decrease of planarity and an enhancement of steric strains in the complexes.
About the authors
S. V. Zaitseva
Krestov Institute of Solution Chemistry
Author for correspondence.
Email: svz@isc-ras.ru
Russian Federation, ul. Akademicheskaya 1, Ivanovo, 153045
S. A. Zdanovich
Krestov Institute of Solution Chemistry
Email: svz@isc-ras.ru
Russian Federation, ul. Akademicheskaya 1, Ivanovo, 153045
O. I. Koifman
Krestov Institute of Solution Chemistry; Ivanovo State University of Chemical Technology
Email: svz@isc-ras.ru
Russian Federation, ul. Akademicheskaya 1, Ivanovo, 153045; Ivanovo