Архів / Том LIII 2018

Galyna MIDYANA¹, Olena PAL’CHIKOVA², Oksana KHAVUNKO¹, Stepan MIDYANYI³

¹Department of the Physical Chemistry of Fossil Fuels, Litvinenko Institute of Physical Organic Chemistry and Coal Chemistry of National Academy of Sciences of Ukraine, Naukova St. 3a, 79060 Lviv, Ukraine
²Institute of Geology and Geochemistry of Combustible Minerals of National Academy of Sciences of Ukraine, Naukova St. 3a, 79060 Lviv, Ukraine
³Lviv National University of Veterinary Medicine and Biotechnologies named after S.Z.Gzhytskyj Pekarska St. 50, 79010 Lviv, Ukraine

DOI: https://doi.org/10.37827/ntsh.chem.2018.53.063

THE EFFECT OF SOLVENTS ON THE KINETICS OF CIS-TRANS ISOMERIZATION OF SELECTED AROMATIC AZO COMPOUNDS

The data on rate constants of cis-transisomerization of selected aromatic azo compounds in different solvents are summarized using linear multiparameter equation:
lgk = a₀ + a₁f(n²) + a₂f(ε) + a₃B + a₄Е_т + a₅δ² + а₆V_м,
considering specific and non-specific solvation as well as influence of different structural factors. The correlation equations, representing the relationship between reaction rate and solvent properties at different temperatures were analyzed:
lgk₂₅ = –6.3650 + (9.0495 ± 1.0416)f(n²) – (0.0097 ± 0.0009)δ² + (0.0691 ± 0.0117)E_т
R = 0.9854; s ± 0.0439
and
lgk₄₅ = –5.3342 + (8.0411 ± 1.1280)f(n²) + (0.0527 ± 0.0127)E_т – (0.0072 ± 0.0009)δ²
R = 0.9678; s ± 0.0475.
In both cases (at temperatures 25 and 45 °C), polarization and electrophilicity accelerate the process, whereas cohesive energy of medium makes it more sluggish.

Key words: Koppel-Palm solvation model, multiparameter equation, solvent, azo compound

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How to Cite

MIDYANA G., PAL’CHIKOVA O., KHAVUNKO O., MIDYANYI S. THE EFFECT OF SOLVENTS ON THE KINETICS OF CIS-TRANS ISOMERIZATION OF SELECTED AROMATIC AZO COMPOUNDS Proc. Shevchenko Sci. Soc. Chem. Sci. 2018 Vol. LIII. P. 63-67.