Kinetic parameters of the electroreduction of oxygen on a graphitized carbon electrode activated by tetrakis(4-methoxyphenyl)porphyrin and its cobalt complexes

Tesakova, Mariya V.; Носков, А. В.; Базанов, М. И.; Berezina, N. M.; Parfenyuk, V. I.

doi:10.1134/s0036024411120326

Cited by 21 publications

(9 citation statements)

References 6 publications

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“…The a glassy carbon electrode (Siggradur, Germany), 4 mm in diameter, and fluoroplastic insulation of side surface serves as working electrode. The three-electrode electrochemical cell [16] was connected with potentiostat P-30SM (Elin, Chernogolovka, Russia). All electrochemical measurements were carried out in argon atmosphere by passing argon for 30-40 min through the solution before each measurement [16].…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

Electrochemical determination of antioxidant properties of a series of tetraphenylporphyrin derivatives and their zinc complexes

Tesakova

Семейкин

Parfenyuk

2015

J. Porphyrins Phthalocyanines

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Zinc complexes of a series of substituted tetraphenylporphyrins containing OH-groups in the phenyl rings were synthesized. Their antioxidant capacity was estimated in reaction of the porphyrins with 2,2′-diphenyl-1-picrylhydrazyl (DPPH) by cyclic voltammetry. The electron absorption spectra of the all synthesized compounds before and after the reaction with 2,2′-diphenyl-1-picrylhydrazyl were recorded. The effect of structure of the porphyrins and zinc complexes on their antioxidant capacity was discussed.

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Section: Electrochemical Measurementsmentioning

confidence: 99%

Electrochemical determination of antioxidant properties of a series of tetraphenylporphyrin derivatives and their zinc complexes

Tesakova

Семейкин

Parfenyuk

2015

J. Porphyrins Phthalocyanines

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“…Электрохимические измерения проводили в трехэлектродной электрохимической ячейке [23,24] в свежеприготовленных растворах с концентрацией фонового электролита 0.02 М при температуре 25±0.5 ○ C. Поляризацию рабочего электрода осуществляли с помощью потенциостата Р-30SM фирмы Elins (г. Черноголовка). Рабочим электродом в DPPH-тесте служил стержень из стеклоуглерода (Siggradur, Germany) с площадью рабочей поверхности 0.12 см 2 .…”

Section: экспериментальная частьunclassified

Substituted Tetraphenylporphyrins as Promising Molecular Systems with High Antioxidant Activity

Kuzmin¹,

Chulovskaya²,

Tesakova³

et al. 2014

MHC

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“…The general mechanism of one-electron oxidation and reduction of porphyrins is determined by their structure and stereochemistry [1][2][3]. The unique por phyrin structure provides ample opportunities for developing systems with the given electrochemical properties [4,5]. It is known that electrochemical properties of porphyrins are determined by the pres ence and nature of substituents at the periphery of the porphyrin ring.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical properties and antioxidant activity of tetraphenylporphyrin derivatives

2015

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The method of cyclic voltammetry is used to estimate antioxidant activity of tetraphenylporphyrin (H 2 TPhP), 5,10,15,20 tetrakis(4' hydroxyphenyl)porphyrin (H 2 T(4 OHPh)P), and 5,10,15,20 tetrakis(4' hydroxy 3'5' di tert butylphenyl)porphyrin (H 2 T(4 OH 3,5 di t BuPh)P) in the reaction with 2,2 diphe nyl 1 picrylhydrazyl (DPPH). It is found that two of the three studied compounds, i.e., 5,10,15,20 tet rakis(4' hydroxyphenyl)porphyrin and 5,10,15,20 tetrakis(4' hydroxy 3'5' di tert butylphenyl)porphyrin are characterized by antioxidant activity with respect to the stable 2,2 diphenyl 1 picryl hydrazyl radical that increases in the following series: H 2 TPhP < H 2 T(4 OH 3,5 di t BuPh)P < H 2 T(4 OHPh)P. At the same time, tetraphenylporphyrin possesses practically no antiradical properties. The results obtained in this work indicate that, similar to the mechanism for phenol antioxidants as substances with a mobile hydrogen atom (proton donors), one of the mechanisms of the antioxidant effect of the studied porphyrins is related to their interaction with free radicals, particularly with DPPH according to the following reaction: AH + DPPH • → A • + DPPH H. A change in the structure of the H 2 T(4 OH 3,5 di t BuPh)P molecule due to formation of a sterically hindered phenol fragment resulting from introduction of two tert butyl substituents causes a decrease in the antioxidant activity of the studied porphyrins.

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Kinetic parameters of the electroreduction of oxygen on a graphitized carbon electrode activated by tetrakis(4-methoxyphenyl)porphyrin and its cobalt complexes

Cited by 21 publications

References 6 publications

Electrochemical determination of antioxidant properties of a series of tetraphenylporphyrin derivatives and their zinc complexes

Electrochemical determination of antioxidant properties of a series of tetraphenylporphyrin derivatives and their zinc complexes

Substituted Tetraphenylporphyrins as Promising Molecular Systems with High Antioxidant Activity

Electrochemical properties and antioxidant activity of tetraphenylporphyrin derivatives

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