Voltammetric study of the redox chemistry of 2,3-dihydroxy-quinoxaline and its zinc complexes in non-aqueous medium

Bodini, Mario E.; Valle, M.; Copia, Georgina; Soto, Cecilia

doi:10.1016/s0277-5387(97)00419-1

Cited by 4 publications

(2 citation statements)

References 11 publications

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“…The reduction of quinoxalines in aprotic media produces the radical species [11][12][13][14], and is different from that in protic media [15][16][17][18][19][20][21][22]. For this reason, 98% H 2 SO 4 was used to adjust the solution pH and to act as the proton source of the electrochemical reaction.…”

Section: Methodsmentioning

confidence: 99%

Electrochemical behavior of conjugated quinoxaline derivatives

Wang

Ramaraj

Okajima

et al. 2004

Journal of Electroanalytical Chemistry

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Section: Methodsmentioning

confidence: 99%

Electrochemical behavior of conjugated quinoxaline derivatives

Wang

Ramaraj

Okajima

et al. 2004

Journal of Electroanalytical Chemistry

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“…There are several comprehensive reviews covering quinoxaline chemistry and applications [ 40 , 42 , 43 , 44 , 45 , 46 , 47 ]. Nonetheless, studies devoted to quinoxaline derived radicals are rather scarce and include studies performed by pulse radiolysis [ 48 , 49 , 50 , 51 , 52 ], photochemistry [ 53 , 54 , 55 , 56 , 57 ], electrochemistry [ 58 , 59 , 60 ], and Fenton systems [ 61 ].…”

Section: Introductionmentioning

confidence: 99%

Spectral Probe for Electron Transfer and Addition Reactions of Azide Radicals with Substituted Quinoxalin-2-Ones in Aqueous Solutions

Skotnicki

Ostrowski

Dobrowolski

et al. 2021

IJMS

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The azide radical (N3●) is one of the most important one-electron oxidants used extensively in radiation chemistry studies involving molecules of biological significance. Generally, it was assumed that N3● reacts in aqueous solutions only by electron transfer. However, there were several reports indicating the possibility of N3● addition in aqueous solutions to organic compounds containing double bonds. The main purpose of this study was to find an experimental approach that allows a clear assignment of the nature of obtained products either to its one-electron oxidation or its addition products. Radiolysis of water provides a convenient source of one-electron oxidizing radicals characterized by a very broad range of reduction potentials. Two inorganic radicals (SO4●−, CO3●−) and Tl2+ ions with the reduction potentials higher, and one radical (SCN)2●− with the reduction potential slightly lower than the reduction potential of N3● were selected as dominant electron-acceptors. Transient absorption spectra formed in their reactions with a series of quinoxalin-2-one derivatives were confronted with absorption spectra formed from reactions of N3● with the same series of compounds. Cases, in which the absorption spectra formed in reactions involving N3● differ from the absorption spectra formed in the reactions involving other one-electron oxidants, strongly indicate that N3● is involved in the other reaction channel such as addition to double bonds. Moreover, it was shown that high-rate constants of reactions of N3● with quinoxalin-2-ones do not ultimately prove that they are electron transfer reactions. The optimized structures of the radical cations (7-R-3-MeQ)●+, radicals (7-R-3-MeQ)● and N3● adducts at the C2 carbon atom in pyrazine moiety and their absorption spectra are reasonably well reproduced by density functional theory quantum mechanics calculations employing the ωB97XD functional combined with the Dunning’s aug-cc-pVTZ correlation-consistent polarized basis sets augmented with diffuse functions.

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Electrochemistry of Zinc

Stroka

Maksymiuk

Galus

2006

Encyclopedia of Electrochemistry

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The sections in this article are Double‐layer Properties of Zinc Electrodes Pc ‐Zinc in Aqueous Solutions Zn Single Crystals in Aqueous Solutions Electrochemical Properties and Kinetics of the Zn ( II )/ Zn ( Hg ) and Zn ( II )/ Zn Systems Electrochemistry in Aqueous Solutions Electrochemistry in Water‐organic Solvent Mixtures Electrochemistry in Nonaqueous Solvents The Influence of Organic Compounds on the Electrode Processes The Electrochemical Properties of the Zinc Complexes Properties of Zinc Oxide Electrode Electrode Processes in Molten Salts Deposition and Underpotential Deposition of Zn on Solid Electrodes Underpotential Deposition of Zinc Zn UPD on Pt Zn UPD on Au Zinc Electrodeposition on Solid Electrodes Electrodeposition on Zn Electrodes Electrodeposition on Other Electrodes Passivation and Corrosion of Zinc Anodic Dissolution and Passivation of Zinc Corrosion Applied Electrochemistry Batteries Ni – Zn Cells Zn –Air Batteries Zn – Mn O 2 Batteries Zn – Ag Batteries Other Cells Electrowinning Zinc Electroplating Zinc Alloys Electroplating Electrochemical Sensors and Modified Electrodes Potentiometric Sensors Voltammetric/Amperometric Sensors Modified Electrodes

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Voltammetric study of the redox chemistry of 2,3-dihydroxy-quinoxaline and its zinc complexes in non-aqueous medium

Cited by 4 publications

References 11 publications

Electrochemical behavior of conjugated quinoxaline derivatives

Electrochemical behavior of conjugated quinoxaline derivatives

Spectral Probe for Electron Transfer and Addition Reactions of Azide Radicals with Substituted Quinoxalin-2-Ones in Aqueous Solutions

Electrochemistry of Zinc

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