Polarography of heterocyclic azo compounds and their metal complexes

Florence, T.M.; Johnson, D.A.; Batley, Graeme E.

doi:10.1016/s0022-0728(74)80281-0

Cited by 47 publications

(22 citation statements)

References 9 publications

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“…Unstable hydrazo intermediates have been reported in the case of the reduction of aromatic azo compounds during polarography. [30][31][32] The electrode reaction of dimethylaminoazobenzene involves two electrons:…”

Section: Cyclic Voltammetry Of 5-br-papsmentioning

confidence: 99%

Adsorptive Voltammetry of 2-(5-Bromo-2-pyridyl)azo-5-[N-n-propyl-N-(3-sulfopropyl)amino]phenol on a Carbon Paste Electrode in the Presence of Organic Cations and Polycation

et al. 2006

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The adsorption of ion-association complexes on a carbon paste electrode (CPE) was investigated by cyclic voltammetry using an electroactive hydrophobic anion probe. The redox reactions of 2-(5-bromo-2-pyridyl)azo-5-[N-n-propyl-N-(3-sulfopropyl)amino]phenol (5-Br-PAPS), the analytical probe, were irreversible. The reduction of the azo group and the oxidation of the phenol were observed at -0.1 V and 0.9 V vs. SCE, respectively, in a 0.1 mol L -1 H2SO4 solution. The peak currents for the redox reaction increased with the concentration of the cationic surfactant and the accumulation time. The increase in the ratio of the peak current to the concentration of cationic surfactants was proportional to the hydrophobicity. The peak current for 5-Br-PAPS also increased when a polycation, polyhexamethylene biguanide hydrochloride, was added and was strongly dependent on the ionic strength and pH, in contrast to cationic surfactants.

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Section: Cyclic Voltammetry Of 5-br-papsmentioning

confidence: 99%

Adsorptive Voltammetry of 2-(5-Bromo-2-pyridyl)azo-5-[N-n-propyl-N-(3-sulfopropyl)amino]phenol on a Carbon Paste Electrode in the Presence of Organic Cations and Polycation

et al. 2006

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“…So, the mechanism of the reduction process for peak I of IM in the pH range of 2 -8 can be suggested as given in Scheme 4: As can be seen in Scheme 4, the (=N-NH-) single bond of IM was cleaved with the uptake of two electrons and two protons. 60,61 And then the intermediate product of the electrode process was rapidly reduced to the amine by means of 2-electron process. As a result, both reduction processes occur at same potential.…”

Section: Electrode Reaction Mechanismmentioning

confidence: 99%

Electrochemical Reduction of Isatin-monohydrazone on Mercury Electrode

Çakır¹,

Bíçer²,

Arslan³

2015

Croat. Chem. Acta

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Abstract. Electrochemical behaviour of isatin monohydrazone (IM) on a hanging mercury drop electrode in the Britton-Robinson (B-R) buffer solution of pH = 2.00 -9.00 has been investigated using square-wave voltammetry (SWV) and cyclic voltammetry (CV) techniques. In the pH range of 2.00 -5.00, the voltammogram of IM exhibited a single cathodic irreversible peak. When the pH value exceeds 5.00, a new cathodic irreversible peak was also seen. According to the voltammetric data, a plausible electrode reaction mechanism of IM was proposed. The first reduction peak of IM is resulted from the reduction of =N-NH-group with consumption of 2e -/2H + . Also, its second cathodic peak is formed by the participation of 2e -/2H + for the reduction of -N=N-group on its tautomeric form.

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“…PAN has been used successfully for the polarographic [4] and adsorptive stripping voltammetric [5,6] determination of traces of metal ions. For this reason the electrochemical properties of PAN such as the irreversible reduction of its azo group (Fig.…”

Section: Introductionmentioning

confidence: 99%

“…In 30 % (v=v) ethanol-water solution a well-de®ned reduction wave was observed at a hanging mercury drop electrode (HMDE) [5,6]. An investigation to determine the number of electrons (n) involved in the reduction of the PAN azo group in 50 % ethanol-water solution was carried out by Florence et al [4] using both polarography and controlled potential coulometry. The latter technique appeared to be inappropriate because the hydrazo compound (1-(2 H -pyridylhydrazino)-2-naphthol) resulting from the reduction of PAN is known to disproportionate rapidly (Fig.…”

Section: Introductionmentioning

confidence: 99%