Electrochemical bond cleavage in pesticide ioxynil. Kinetic analysis by voltammetry and impedance spectroscopy

0484250 - ÚOCHB 2018 RIV BG eng J - Článek v odborném periodiku
Sokolová, R. - Giannarelli, S. - Fanelli, N. - Pospíšil, Lubomír
Electrochemical bond cleavage in pesticide ioxynil. Kinetic analysis by voltammetry and impedance spectroscopy.
Bulgarian Chemical Communications. Roč. 49, SI C (2017), s. 134-138. ISSN 0324-1130
Institucionální podpora: RVO:61388963
Klíčová slova: electrochemical impedance spectroscopy * rate constant * self-protonation * faradaic phase angle * halogen cleavage * EC processes fitting
Obor OECD: Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)
Impakt faktor: 0.242, rok: 2017

We cleavage of carbon-halogen bond is a common process in electrochemistry of halogenated aromatic compounds. We describe such a cleavage for the reduction of pesticide ioxynil, 4-hydroxy-3,5-diiodobenzonitrile. The reaction mechanism is complicated by the presence of two iodine substituents and by self-protonation equilibrium. We compare three methods for the determination of the rate-determining step. The electrochemical impedance spectroscopy is rarely used for the determination of coupled fast chemical reactions of organic compounds. Our procedure involves simulation of cyclic voltammograms, search for parameters of Gerischer impedance and simulation of the faradaic phase angle as a function of the applied frequency. The last procedure is considerably more sensitive for the detection of chemical reaction compared to fitting the entire electrode impedance spectrum.
Trvalý link: http://hdl.handle.net/11104/0279383