The role of the entropy factor in the kinetics of complex formation of non-planar porphyrins with localized and delocalized NH bonds

Dmitry Berezin

doi:10.52957/27821900_2022_01_48

UDC

547 544.164 544.42

THE ROLE OF THE ENTROPY FACTOR IN THE KINETICS OF COMPLEX FORMATION OF NON-PLANAR PORPHYRINS WITH LOCALIZED AND DELOCALIZED NH BONDS The role of the entropy factor in the kinetics of complex formation of non-planar porphyrins with localized and delocalized NH bonds

АА Аа

Published in From Chemistry Towards Technology Step-By-Step · Pages 48–57 · Rubric: Scientific articles

DOI: https://doi.org/10.52957/27821900_2022_01_48

Received: 14.03.2022 Accepted: 22.03.2022 Published: 23.03.2022

Authors

Dmitry Berezin

Academic degree: doctor of chemical sciences

Science rang: academician author.academy_titles.37 ; professor

Ivanovo State University of Chemistry and Technology

ABSTRACT

The paper concerns NH-bonds chemical activity exhibiting in porphyrin molecules typical of macrocycles with planar or non-planar polarized structures. It is not limited by the increasing rate of their metal complexing indicator reaction in proton-donating media in comparison with proton-donating ones. The work dwells on the entropy of the process towards more positive values as the electron-donating properties of the solvent increase. It is due to the formation of molecular complexes "porphyrin - electron-donor" increasing the solvation of the initial state of the complexing reaction. The deformation of the planar structure of the H2P macrocycle expressed by the example of N- and dodeca-substituted porphyrin accompanying by an appreciable polarization of the molecule does not lead to the appearance of NH-bonds chemical activity.

KEYWORDS

tetrapyrrole macroheterocyclic compounds; porphyrins; complexing reaction; chemical activity of NH bonds; activation entropy

Funding

The assistance provided by Semeykin A.S., Doctor of Chemistry, Professor was greatly appreciated. This work was supported by Ivanovo State University of Chemistry and Technology, Ivanovo, Russia Centre for the Collective Use of Scientific Equipment (the Russian Ministry of Education and Science, Agreement No. 075-15-2021-671)

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Editor in chief

Dmitry Berezin

Deputy Editor in Chief

Igor Abramov

abramovig@ystu.ru

Executive secretary

Zhanna Chirkova

chirkovazhv@ystu.ru

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Berezin D. B. The role of the entropy factor in the kinetics of complex formation of non-planar porphyrins with localized and delocalized NH bonds // From Chemistry Towards Technology Step-By-Step. 2022. no. 1. pp. 48-57. DOI: https://doi.org/10.52957/27821900_2022_01_48. (Date of access 12.09.2026).

MLA

Dmitry Berezin. "The role of the entropy factor in the kinetics of complex formation of non-planar porphyrins with localized and delocalized NH bonds." From Chemistry Towards Technology Step-By-Step 3.1 (2022): 48-57. DOI: https://doi.org/10.52957/27821900_2022_01_48.

APA

Berezin D. B. (2022). The role of the entropy factor in the kinetics of complex formation of non-planar porphyrins with localized and delocalized NH bonds. From Chemistry Towards Technology Step-By-Step, 3(1), 48-57. https://doi.org/10.52957/27821900_2022_01_48

Chicago

Dmitry Berezin. "The role of the entropy factor in the kinetics of complex formation of non-planar porphyrins with localized and delocalized NH bonds." From Chemistry Towards Technology Step-By-Step 3, no. 1 (2022): 48-57. https://doi.org/10.52957/27821900_2022_01_48.

WIKI

{{cite journal | author = Berezin D. B. | title = The role of the entropy factor in the kinetics of complex formation of non-planar porphyrins with localized and delocalized NH bonds | journal = From Chemistry Towards Technology Step-By-Step | year = 2022 | volume = 3 | issue = 1 | pages = 48-57 | doi = 10.52957/27821900_2022_01_48 }}

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THE ROLE OF THE ENTROPY FACTOR IN THE KINETICS OF COMPLEX FORMATION OF NON-PLANAR PORPHYRINS WITH LOCALIZED AND DELOCALIZED NH BONDS The role of the entropy factor in the kinetics of complex formation of non-planar porphyrins with localized and delocalized NH bonds

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