Spectrophotometric Studies of Dilute Aqueous Periodate Solutions

Crouthamel, C.E.; Meek, H. V.; Martin, Don S.; Banks, Charles V.

doi:10.1021/ja01177a026

Cited by 128 publications

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“…Lamy (4) attributed the minimum to a double layer effect, namely, repulsion of the reacting anion from the similarly charged electrode (5), and thereby accounted for the dependence on ionic strength. On the basis of existing thermodynamic data for the solution equilibria of periodate (6), he assumed that the predominant species at high p H was H310,2-and concluded that the p H dependence resulted from the fact that the electroactive species was H4106-formed from the dinegative anion in a labile protonation reaction preceding electron transfer. However, more recent studies of periodate equilibria (7)(8)(9) have shown that the species H21063-and H2I2OIo4-are present in the pH range 11-14 so that p H dependence also results from variations in the bulk concentrations of the various anions.…”

Section: Introductionmentioning

confidence: 99%

The Electroreduction of Periodate Anion in Alkaline Media

Fawcett¹,

Lee²

1971

Can. J. Chem.

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The electroreduction of periodate anion was studied at a dropping mercury electrode in aqueous solutions in the p H range 11-13.3 where the process is markedly affected by the double layer. The electrode reaction was found to be complex, its mechanism depending on both p H and ionic strength. The effects of the double layer on the component reactions are discussed with respect to current theoretical developments. L'Clectrordduction de I'anion periodate a ttC CtudiCe au moyen d'une electrode a gouttes de mercure, en solution aqueuse et dans une zone de pHcomprise entre I1 et 13.3, oh le processus est pronfondement influencC par la double couche. La reaction a I'Clectrode est compliquCe et son mtcanisme depend a la fois du p H et de la force ionique. Les effets de la double couche sur les reactions des constituants sont discutes par rapport aux rCsultats thtoriques actuels.

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Section: Introductionmentioning

confidence: 99%

The Electroreduction of Periodate Anion in Alkaline Media

Fawcett¹,

Lee²

1971

Can. J. Chem.

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“…2) implies that there are at least two pH-dependent effects. The increase in rate from pH 8.5 to pH 7.5 may be due to the hydration and ionization of the periodate anion to an unreactive, octahedral form, H" 102-(pK = 8.36; Crouthamel et al, 1949) and the increasing positive charge on histidine residues at the ironbinding sites. Alsaadi et al (1981) have assigned pK values of 7.50 and 7.70 to histidine residues involved in liganding iron and the anion respectively, the former being lowered to 7.30-7.40 in the presence of complex anions.…”

Section: Resultsmentioning

confidence: 99%

The ability of salts to inhibit the reaction between periodate anions and ovotransferrin

Hsuan¹

1986

Biochemical Journal

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The reaction between periodate anions and apo-ovotransferrin results in the rapid abolition of the iron-binding ability of the protein and the loss of approximately 4 mol of tyrosine/mol of protein. The degree of inhibition exerted by a variety of salts on the rate of this reaction is found to be inconsistent with the lyotropic series and suggests the existence of a complex anion-binding site in the apoprotein. The existence of this site may explain the action of periodate anions on ovotransferrin.

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“…There seems to be a literature contradiction about the dominating aqueous form of periodate ion (IO 4 − or H 4 IO 6 − ), [26][27][28][29][30] but this is seldom important from the view point of redox chemistry. 6…”

Section: Introductionmentioning

confidence: 99%

Kinetic studies of hydroxyquinone formation from water soluble benzoquinones

et al. 2014

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Table of contents entryThe kinetics of the reactions between 1,4-benzoquinones and hydrogen peroxide were studied.A systematic study of substituent effects revealed a Hammett-like correlation, where the rate of reaction is mainly determined by electronic effects. 3 AbstractThe kinetics and mechanisms of the redox reactions between hydrogen peroxide and 1,4-benzoquinone, 2-methyl-1,4-benzoquinone, 2,6-dimethyl-1,4-benzoquinone, 2-chloro-1,4-benzoquinone and 2,6-dichloro-1,4-benzoquinone were studied in aqueous media using spectrophotometric monitoring. The formation and decay of a hydroxylated 1,4-benzoquinone was detected. The formation of the intermediate was first order with respect to the parent 1,4-bezoquinone and hydrogen peroxide, whereas inverse first order dependence was revealed with respect to hydrogen ion. The decomposition reaction had two parallel pathways: one was first order with respect to the intermediate, while the other showed second-order dependence.The values of the rate constant measured for the formation step were successfully correlated with both the redox potentials of the substituted quinone/hydroquinone systems and the pK a values of the hydroxylated quinone derivatives. Therefore, electronic effects govern the reactivity of the quinones in this process. NMR and GC-MS measurements were carried out to identify the products in the system. Quantum mechanical calculations were also carried out in these systems.4

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Spectrophotometric Studies of Dilute Aqueous Periodate Solutions

Cited by 128 publications

References 0 publications

The Electroreduction of Periodate Anion in Alkaline Media

The Electroreduction of Periodate Anion in Alkaline Media

The ability of salts to inhibit the reaction between periodate anions and ovotransferrin

Kinetic studies of hydroxyquinone formation from water soluble benzoquinones

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