0475604 - ÚFCH JH 2018 RIV BG eng J - Journal Article
Sokolová, Romana - Giannarelli, S. - Fanelli, N. - Pospíšil, Lubomír
Electrochemical bond cleavage in pesticide ioxynil. Kinetic analysis by voltammetry and impedance spectroscopy.
Bulgarian Chemical Communications. Roč. 49, C (2017), s. 134-138. ISSN 0324-1130
R&D Projects: GA ČR(CZ) GA14-05180S
Institutional support: RVO:61388955
Keywords : electrochemical impedance spectroscopy * rate constant * self-protonation
OECD category: Physical chemistry
Impact factor: 0.242, year: 2017

The 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.
Permanent Link: http://hdl.handle.net/11104/0272280