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:doi:10.52957/27821900_2022_01_113

UDC 547 UDC 544.164

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

Published в From Chemistry Towards Technology Step-By-Step · Volume 3, Issue 1, 2022 · Pages 113–122 · Rubrics: Scientific articles

DOI 10.52957/27821900_2022_01_113

Received: 14.03.2022 Accepted: 22.03.2022 Published: 23.03.2022 Language of publication: ENG

Authors

Dmitry Berezin ¹

1 Ivanovo State University of Chemistry and Technology
Ivanovo, Ivanovo, Russian Federation

ABSTRACT

The paper concerns NH-bonds chemical activity exhibiting in porphyrin molecules typical of macrocycles with planar or non-planar polarized struc-tures. It is not limited by the increasing rate of their metal complexing indi-cator 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 ap-preciable polarization of the molecule does not lead to the appearance of NH-bonds chemical activity.

KEYWORDS

tetrapyrrole macroheterocyclic com-pounds; porphyrins; complexing reaction; chemical activity of NH bonds; activation entropy

Information Text

Authors:

1. Ivanovo State University of Chemistry and Technology

Ivanovo, Ivanovo, Russian Federation

Type:

Article

Pages:

from 113 to 122

Status:

Published

Subject area:

UDC 547
UDC 544.164

Language:

English

Keywords:

tetrapyrrole macroheterocyclic com-pounds; porphyrins; complexing reaction; chemical activity of NH bonds; activation entropy

Funding

The assistance provided by Semeykin A.S., Doctor of Chemistry, Professor was greatly ap-preciated. 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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