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Experimental and mechanistic study of the inhibitory effects by phenolics on the oscillations of the OrbA n-Epstein Reaction

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2018
Authors
Cervellati, Rinaldo
Greco, Emanuela
Blagojević, Slavica
Blagojević, Stevan
Anić, Slobodan
Čupić, Željko
Article (Published version)
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Abstract
The system KSCN-H2O2-CuSO4-NaOH, also known as the OrbA n-Epstein oscillatory reaction, is exposed to external perturbations by several phenolic compounds: catechol, resorcinol, hydroquinone, 2,5-dihydroxybenzoic acid, 2,6-dihydroxybenzoic acid, 2,3-dihydroxybenzoic acid, 2,4-dihydroxybenzoic acid, 3,4-dihydroxybenzoic acid, 3,5-dihydroxybenzoic acid, caffeic acid, and ferulic acid. As a result of the performed perturbation in most examined cases, oscillations have been inhibited for some characteristic time, and resumed afterwards. The evaluated inhibition time is typical for each substance and strongly dependent on its concentration. The chemical mechanism of the interaction between the OrbA n-Epstein system and phenolic compounds is briefly discussed. Numerical simulations are performed using the original OrbA n-Epstein model with 30 reactions, extended by three reactions describing the interaction with inhibitory substances. The rate constants of three added reactions are adjusted ...to fit experimental inhibition times, and compared among used compounds. The observed effects are discussed further in relation with the bond dissociation enthalpy theory. Unlike other tested compounds, 2,5-dihydroxybenzoic acid remains off from predicted order of activity.

Keywords:
Orban-Epstein oscillatory reaction / Catechol / Resorcinol / Hydroquinone / Dihydroxybenzoic acids / Hydroxycinnamic acids
Source:
Reaction Kinetics, Mechanisms and Catalysis, 2018, 123, 1, 125-139
Publisher:
  • Springer Netherlands
Projects:
  • Dynamics of nonlinear physicochemical and biochemical systems with modeling and predicting of their behavior under nonequilibrium conditions (RS-172015)
  • Nanostructured Functional and Composite Materials in Catalytic and Sorption Processes (RS-45001)

DOI: 10.1007/s11144-017-1306-8

ISSN: 1878-5190

WoS: 000419514200009

Scopus: 2-s2.0-85034061184
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URI
http://cer.ihtm.bg.ac.rs/handle/123456789/2462
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