THE ROLE OF THE ENTROPY FACTOR IN THE KINETICS OF COMPLEX FORMATION OF NON-PLANAR PORPHYRINS WITH LOCALIZED AND DELOCALIZED NH BONDS
Abstract and keywords
Abstract (English):
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
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References

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