Thermodynamic quantities for the oxidation of ranitidine by diperiodatocuprate(III) in aqueous alkaline medium

Veeresh, T. M.; Patil, R. K.; Nandibewoor, Sharanappa T.

doi:10.1007/s11243-008-9140-5

Cited by 10 publications

(4 citation statements)

References 28 publications

(32 reference statements)

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“…Exner [42,43] advocates an alternative method for the treatment of experimental data. If the rates of several reactions in a series have been measured at two temperatures and log k 2 (at T 2 ) is linearly related to log k 1 (at T 1 ), i.e.…”

Section: Discussionmentioning

confidence: 99%

Mechanistic investigations on the oxidation of l-valine by diperiodatocuprate(III) in aqueous alkaline medium: a kinetic model

Deganatti

Shetti

Nandibewoor

2008

Transition Met Chem

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The oxidation of L-valine (L-val) by diperiodatocuprate(III) (DPC) in aqueous alkaline medium at a constant ionic strength of 3.0 9 10 -3 mol dm -3 was studied spectrophotometrically at 298 K and follows the rate law;where K 4 , K 5 and K 6 are the equilibrium constants for the different steps involved in the mechanism, k is the rate constant for the slow step of the reaction. The appearance of [L-val] term in both numerator and denominator explains the observed less than unit order in [L-val]. Similarly the appearances of [H 3 IO 6 2-] and [OH -] in the denominator obey the experimental negative less than unit order in [H 3 IO 62-] and [OH -], respectively. The oxidation reaction in alkaline medium proceeds via a DPC-L-valine complex, which decomposes slowly in a rate determining step followed by other fast steps to give the products. The main products were identified by spot test and spectroscopic studies.

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Section: Discussionmentioning

confidence: 99%

Mechanistic investigations on the oxidation of l-valine by diperiodatocuprate(III) in aqueous alkaline medium: a kinetic model

Deganatti

Shetti

Nandibewoor

2008

Transition Met Chem

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“…Further in the rate determining step the complex decomposes to give the carbocation AMT radical, MnO 4 2-(Mn 6+ ) and H + species. Such type of carbocation is observed in literature 14 . In a fast step, carbocation AMT radical hydrolyses to give the intermediate compound and H + .…”

Section: Mechanismmentioning

confidence: 54%

“…A Lineweaver-Burk plot also proved the complex formation between oxidant and substrate, which explains less than unit order in [AMT]. Such type of complex formation between oxidant and substrate has been observed in other studies 14 .…”

Section: Scheme 1: Detailed Mechanismmentioning

confidence: 56%

“…These values are given in Table 2. A comparison of the ΔH value of second step (26.8 kJ mol -1 ) of Scheme 1 with that of ΔH # (70.0 kJ mol -1 ) obtained for the slow step of the reaction shows that these values mainly refer to the rate limiting step, supporting the fact that the reaction before rate determining step is fairly fast and it involves low activation energy 14 .…”

Section: Mechanismmentioning

confidence: 69%

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2012

IJPSR

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The kinetics of oxidation of amitriptyline by potassium permanganate in aqueous sulphuric acid medium at 298K and at a constant ionic strength of 0.20 mol dm-3 has been investigated spectrophotometrically. The reaction exhibits 5:4 stoichiometry (5 Amitriptyline:4 KMnO 4). The reaction was first order with respect to manganese(VII) concentration. The order with respect to amitriptyline was found to be less than unity (0.80). Increase in acid concentration increased the rate. The order with respect to acid concentration was also less than unity (0.40). The effect of added products, ionic strength and dielectric constant has been studied on the rate of reaction. The oxidation products were identified by using 2, 4 DNP derivative, IR, GCMS spectral studies. A suitable mechanism was proposed on the basis of experimental results. The reaction constants involved in the different steps of the reaction mechanism were calculated. The activation parameters with respect to slow step of the mechanism was determined and discussed. INTRODUCTION: Potassium permanganate is widely used as an oxidizing agent as well as an analytical and also as disinfectant reagent. These reactions are governed by the pH of the medium. Among six oxidation states of manganese from +2 to +7, permanganate, Mn(VII), is the most potent oxidation state in acid with reduction potential 1 1.69 V of Mn(VII)/Mn(VI) couple and 1.51 V of Mn(VII)/Mn(II) couple. The oxidation by permanganate ion finds extensive applications in organic syntheses 2 .

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Study of Enhanced Chemiluminescence of Diperiodatocuprate (III) on 1,10-Phenanthroline/Hydrogen Peroxide/Cetyltrimethylammonium Bromide System

et al. 2010

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In the paper, a chemiluminescence (CL) system was developed based on the catalytical effect of diperiodatocuprate (III) (DPC) on the 1,10-phenanthroline (phen)/hydrogen peroxide (H(2)O(2)) in the presence of cetyltrimethylammonium bromide (CTAB). The effects of experimental conditions were investigated. Meanwhile the increase of CL intensity of the DPC/phen/H(2)O(2)/CTAB system is proportional to the concentration of phen in the range of low concentration. The linear range of the calibration curve is 5.0 × 10(-9)-1.0 × 10(-6) mol L(-1), and the corresponding detection limit is 1.9 × 10(-9) mol L(-1). The effects of phenolic compounds (PCs) on the system were investigated. Hydroquinone was used as an example to investigate the application of the CL system to the determination of PCs. The quenched CL intensity is linearly related to the logarithm of concentration of hydroquinone. The linear range of the calibration curve is 2.5 × 10(-9)-1.0 × 10(-5) g mL(-1), and the corresponding detection limit is 1.8 × 10(-9) g mL(-1). This phen and hydroquinone can be synchronously determined. The method was applied to the determination of hydroquinone in water samples and the recoveries were from 92% to 106%.

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Thermodynamic quantities for the oxidation of ranitidine by diperiodatocuprate(III) in aqueous alkaline medium

Cited by 10 publications

References 28 publications

Mechanistic investigations on the oxidation of l-valine by diperiodatocuprate(III) in aqueous alkaline medium: a kinetic model

Mechanistic investigations on the oxidation of l-valine by diperiodatocuprate(III) in aqueous alkaline medium: a kinetic model

Untitled

Study of Enhanced Chemiluminescence of Diperiodatocuprate (III) on 1,10-Phenanthroline/Hydrogen Peroxide/Cetyltrimethylammonium Bromide System

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