Ru(III) catalysis in the oxidation of arenes by periodate. A kinetic study

Radhakrishnamurti, P. S.; Panda, H. P.

doi:10.1007/bf02061286

Cited by 9 publications

(3 citation statements)

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“…Increase in rate with increase in [OH -] indicates the presence of the hydroxylated species of ruthenium (III) as a reactive species, which is shown by the following equilibrium in accordance with the earlier work[41][42][43][44]. The value of x would always be less than six because there are no definite reports of any hexahydroxy species of ruthenium.…”

supporting

confidence: 84%

Ruthenium(III) Catalysed Oxidation of L-Alanine by Alkaline Permanganate: A Kinetic and Mechanistic Approach

Chimatadar¹,

Kini²,

Nandibewoor³

2005

BioInorganic Reaction Mechanisms

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The kinetics of the ruthenium(III) catalysed oxidation of L-alanine by alkaline permanganate was studied spectrophotometrically using a rapid kinetic accessory. The reaction is first order with respect to [oxidant] and [catalyst] with an apparent less than unit order in [substrate] and [alkali] respectively. The results suggest the formation of a complex between the alanine and the hydroxylated species of ruthenium(III). The complex reacts further with the alkaline permanganate species in a rate-determining step, resulting in the formation of a free radical, which again reacts with the alkaline permanganate species in a subsequent fast step to yield the products. The reaction constants involved in the mechanism were calculated. There is a good agreement between observed and calculated rate constants under different experimental conditions. The activation parameters with respect to slow step of the mechanism were calculated and discussed.

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supporting

confidence: 84%

Ruthenium(III) Catalysed Oxidation of L-Alanine by Alkaline Permanganate: A Kinetic and Mechanistic Approach

Chimatadar¹,

Kini²,

Nandibewoor³

2005

BioInorganic Reaction Mechanisms

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“…Periodate is used for the oxidation of different inorganic, organic compounds and catalytic applications at trace levels. [1][2][3][4][5][6] Therefore simple, rapid, sensitive and accurate method is required for the determination of trace amounts of periodate in different samples.…”

Section: Introductionmentioning

confidence: 99%

A facile spectrophotometric method for the determination of periodate using azure B

Narayana¹,

Cherian²

2005

J. Braz. Chem. Soc.

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Foi desenvolvido um método simples, rápido e sensível para a determinação de periodato em amostras de água de rio e em solução. O método é baseado na reação do periodato com iodeto em meio ácido, com liberação de iodo. O iodo liberado diminui a intensidade da cor violeta do azure B, medida em 644 nm. O decaimento da absorbância é diretamente proporcional a concentração de periodato e obedece a lei de Beer na faixa de 0,2 -5,5 μg mL -1 . A absortividade molar, a sensibilidade de Sandell e os limites de detecção e de quantificação encontrados foram 1,09x10 5 L mol -1 cm -1 , 1,75x10 -3 μg cm -2 , 0,07 μg mL -1 and 0,20 μg mL -1 , respectivamente. As condições ótimas de reação e os parâmetros analíticos foram avaliados. O efeito de íons interferentes é descrito. O método proposto foi aplicado com sucesso na determinação de periodato em amostras de águas de rio e em solução.A simple, rapid and sensitive spectrophotometric method has been developed for the determination of periodate in solution and river water samples. The method is based on the reaction of periodate with iodide in an acid medium to liberate iodine. This liberated iodine bleaches the violet color of the azure B and is measured at 644 nm. This decrease in absorbance is directly proportional to the periodate concentration and obeys Beer's law in the range of 0.2 -5.5 μg mL -1 . The molar absorptivity, Sandell's sensitivity, detection limit and quantitation limit of the method were found to be 1.09 X 10 5 L mol -1 cm -1 , 1.75 X10 -3 μg cm -2 , 0.07 μg mL -1 and 0.20 μg mL -1 respectively. The optimum reaction conditions and other analytical parameters were evaluated. The effect of interfering ions on the determination is described. The proposed method has been successfully applied to the determination of periodate in solutions and river water samples.Keywords: periodate determination, spectrophotometry, azure B IntroductionThe determination of iodine compounds, particularly periodate, I(VII) is important in organic chemistry, biology and life sciences, but it is rather difficult to determine I(VII) at low concentrations. Periodate is used for the oxidation of different inorganic, organic compounds and catalytic applications at trace levels. 1-6 Therefore simple, rapid, sensitive and accurate method is required for the determination of trace amounts of periodate in different samples.Many methods have been reported for the determination of periodate, such as thin layer chromatography, 7 capillary zone electrophoresis, 8 pulse polarography, 9 fluorometry 10 Chemeluminiscence. 3 Some of the reported chromogenic reagents for the spectrophotometric determination of periodate are 5,5-dimethyl-1,3-cyclohexanedione bisthiosemicarbazone monohydrochloride, 11 amodiaquine dihydrochloride, 12 ferroin, 13 o-dianisidine, 14 4-bromo-N,N'-bis ( 2-hydroxypropyl)-o-phenylenediamine, 15 2,2'-azinodi (3-ethylbenzothiazol-6-sulphonate). 16 Of these reagents, few are reported to be carcinogenic while few others are less selective, less sensitive, time consuming and suffer fr...

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“…Iodate and periodate exclusively associate with the oxidation of metal ions, [1][2][3] catalytic applications 4 and polyhydroxylated compounds 5,6 at trace levels. Thus, selective and sensitive methods are required for their reliable determination.…”

mentioning

confidence: 99%

Flow-Injection Simultaneous Determination of Iodate and Periodate by Spectrophotometric and Spectrofluorometric Detection

Ensafi

Dehaghi

2000

ANAL. SCI.

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Ru(III) catalysis in the oxidation of arenes by periodate. A kinetic study

Cited by 9 publications

References 4 publications

Ruthenium(III) Catalysed Oxidation of L-Alanine by Alkaline Permanganate: A Kinetic and Mechanistic Approach

Ruthenium(III) Catalysed Oxidation of L-Alanine by Alkaline Permanganate: A Kinetic and Mechanistic Approach

A facile spectrophotometric method for the determination of periodate using azure B

Flow-Injection Simultaneous Determination of Iodate and Periodate by Spectrophotometric and Spectrofluorometric Detection

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