The Chemistry of Argentic Oxide. The Formation of a Silver(III) Complex with Periodate in Basic Solution

Cohen, George L.; Atkinson, Gordon

doi:10.1021/ic50022a018

Cited by 74 publications

(80 citation statements)

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“…The complex was characterized by its UV spectrum, exhibited three peaks at 216, 255, and 362 nm. These spectral features were identical to those reported earlier for DPA [16]. The magnetic moment study revealed that the complex is diamagnetic.…”

Section: Preparation Of Dpasupporting

confidence: 88%

“…DPA was prepared by oxidizing Ag(I) in the presence of KIO 4 as described elsewhere [16]. The complex was characterized by its UV spectrum, exhibited three peaks at 216, 255, and 362 nm.…”

Section: Preparation Of Dpamentioning

confidence: 99%

“…The water-soluble silver(III) periodate complex is reported [16] to be [Ag(IO 6 ) 2 ] 7− . However, in an aqueous alkaline medium and at a high pH range as employed in the study, periodate is unlikely to exist as IO 5− 6 (as present in the complex) as is evident from its involvement in the multiple equilibria (2)-(4).…”

Section: Effect Of Temperaturementioning

confidence: 99%

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Oxidation of diclofenac sodium by diperiodatoargantate(III) in aqueous alkaline medium and its determination in urine and blood by kinetic methods

Naik

Chimatadar

Nandibewoor

2010

Int J of Chemical Kinetics

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The kinetics and oxidation of diclofenac sodium (DFS) by diperiodatoargentate(III) (DPA) in alkaline medium at 298 K and at a constant ionic strength of 0.60 mol dm −3 were studied spectrophotometrically. The oxidation products were [2-(2,6-dicloro-phynylamino)-phenyl]-methenol and Ag(I), identified by LC-ESI-MS and IR spectral studies. The reaction between DFS and DPA in alkaline medium exhibits 1:1 stoichiometry. The reaction is first order in [DPA] and has a less than unit order dependence each in [DFS] and [alkali]. Increasing concentrations of IO − 4 retard the reaction. The active species of DPA proposed to be monoperiodatoargentate(III), and a mechanism is suggested. The rate constants involved in the different steps of the mechanism were determined and are discussed. The activation parameters with respect to a rate-limiting step of the mechanism were determined. The thermodynamic quantities were also determined. Using the oxidation of DFS by DPA, DFS was analyzed by kinetic methods in urine and blood sample. The proposed method enables DFS analysis in the range from 5.0 × 10 −5 to 5.0 × 10 −3 mol dm −3 . C

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Section: Preparation Of Dpasupporting

confidence: 88%

“…DPA was prepared by oxidizing Ag(I) in the presence of KIO 4 as described elsewhere [16]. The complex was characterized by its UV spectrum, exhibited three peaks at 216, 255, and 362 nm.…”

Section: Preparation Of Dpamentioning

confidence: 99%

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Oxidation of diclofenac sodium by diperiodatoargantate(III) in aqueous alkaline medium and its determination in urine and blood by kinetic methods

Naik

Chimatadar

Nandibewoor

2010

Int J of Chemical Kinetics

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“…It should be mentioned that in control experiments with no added sugar, the concentration of DPA was unchanged in a range of water-t-butanol mixtures. DPA anion has the formula [Ag(IO6)2] 7-and possesses a square-planar configuration with the plane formed by one edge from each of the two periodate octahedra (13). A discussion on the reactive silver(III) species in DPA oxidations in alkaline medium has been presented in our earlier reportd s'l~ It is known that in aqueous solutions monosaccharides exhibit mutarotation resulting in an equilibrium between the c~-and fl-forms and the open-chain form of the sugar.…”

Section: Resultsmentioning

confidence: 99%

Kinetics and mechanism of oxidation of some reducing sugars by diperiodatoargentate(III) in alkaline medium

Krishna

Rao

1995

Transition Met Chem

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The kinetics of oxidation of D-glucose, D-galactose, Dfructose, D-ribose, D-arabinose, D-xylose and 2-deoxy-D-glucose by diperiodatoargentate(III) (DPA) have been investigated in alkaline medium. The order of the reaction with respect to [DPA] is unity while the order with respect to [-sugar] is < 1 over the concentration range studied. The rate increases with an increase in [OH-] and there is a marginal decrease in the rate with an increase in [IO~-]. No significant dependence on ionic strength was found, but the rate increases with a decreasing dielectric constant. Formic acid and the corresponding aldonic acids were detected as the products of oxidation. The participation of the open chain form of the sugar and a mechanism involving the initial formation of a complex between the enediol of the sugar and Ag In are proposed.

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“…DPA was prepared by oxidizing Ag(I) in presence of KIO 4 as described elsewhere [17]. The complex was characterized from its UV spectrum, which exhibited three peaks at 216, 255 and 362 nm.…”

Section: Preparation Of Dpamentioning

confidence: 99%

Mechanistic Aspects of Os(VIII)/Ru(III) Catalysed Oxidation of L-phenylalanine by Ag(III) Periodate Complex in Aqueous Alkaline Medium

2009

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The kinetics of oxidation of ruthenium(III) (Ru(III)) and osmium(VIII) (Os(VIII)) catalysed oxidation of L-phenylalanine (L-Pal) by diperiodatoargentate(III) (DPA) in aqueous alkaline medium at 27°C and a constant ionic strength of 0.25 mol dm -3 was studied spectrophotometrically. The involvement of free radicals was observed in the reactions. The reaction between DPA and L-Pal in alkaline medium exhibits stoichiometry as [L-Pal]:[DPA] = 1:1. The reaction is of first order in [Os(VIII)], [Ru(III)] and [DPA] and has negative fractional order in [IO 4 -]. It has less than unit order in [L-Pal] and [OH -]. However, the order in [L-Pal] and [OH -] changes from first order to zero order as their concentrations increase.The main oxidation products were identified by spot test and spectral studies. The probable mechanisms were proposed and discussed. The catalytic constant (K c ) was also calculated for Os(VIII) and Ru(III) catalysis at different temperatures. The activation parameters with respect to slow step of the mechanisms were computed and discussed and thermodynamic quantities were also calculated. It has been observed that the catalytic efficiency for the present reaction is in the order of Os(VIII) [ Ru(III). The active species of catalyst and oxidant have been identified.

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The Chemistry of Argentic Oxide. The Formation of a Silver(III) Complex with Periodate in Basic Solution

Cited by 74 publications

References 0 publications

Oxidation of diclofenac sodium by diperiodatoargantate(III) in aqueous alkaline medium and its determination in urine and blood by kinetic methods

Oxidation of diclofenac sodium by diperiodatoargantate(III) in aqueous alkaline medium and its determination in urine and blood by kinetic methods

Kinetics and mechanism of oxidation of some reducing sugars by diperiodatoargentate(III) in alkaline medium

Mechanistic Aspects of Os(VIII)/Ru(III) Catalysed Oxidation of L-phenylalanine by Ag(III) Periodate Complex in Aqueous Alkaline Medium

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