Kinetics and mechanistic studies of oxidation of fluoroquionoline antibacterial agent norfloxacin by diperiodatocuprate(III) in aqueous alkaline medium

Munavalli, Deepak S.; Naik, Praveen N.; Ariga, Girish G.; Nandibewoor, Sharanappa T.; Chimatadar, Shivamurti A.

doi:10.1080/23312009.2015.1068510

Cited by 6 publications

(3 citation statements)

References 13 publications

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“…Metal ions perform as a catalyst by one of these distinct paths, leading to formation of complexes with reactants . An extremely solvated transition state due to the positive value of Δ H # and Δ G # , given in Table , increases the size of transition state; the moderate values of Δ H # and Δ G # were favorable for electron transfer processes . A negative value of Δ S # represents that the transition state is more ordered than the reactants .…”

Section: Resultsmentioning

confidence: 99%

Ag(I)‐Catalyzed Chlorination of Linezolid during Water Treatment: Kinetics and Mechanism

Kulkarni

Hanagadakar

Malladi

et al. 2018

Int J of Chemical Kinetics

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The kinetic and mechanistic study of Ag(I)‐catalyzed chlorination of linezolid (LNZ) by free available chlorine (FAC) was investigated at environmentally relevant pH 4.0–9.0. Apparent second‐order rate constants decreased with an increase in pH of the reaction mixture. The apparent second‐order rate constant for uncatalyzed reaction, e.g., k″app = 8.15 dm3 mol−1 s−1 at pH 4.0 and k″app. = 0.076 dm3 mol−1 s−1 at pH 9.0 and 25 ± 0.2°C and for Ag(I) catalyzed reaction total apparent second‐order rate constant, e.g., k″app = 51.50 dm3 mol−1 s−1 at pH 4.0 and k″app. = 1.03 dm3 mol−1 s−1 at pH 9.0 and 25 ± 0.2°C. The Ag(I) catalyst accelerates the reaction of LNZ with FAC by 10‐fold. A mechanism involving electrophilic halogenation has been proposed based on the kinetic data and LC/ESI/MS spectra. The influence of temperature on the rate of reaction was studied; the rate constants were found to increase with an increase in temperature. The thermodynamic activation parameters Ea, ΔH#, ΔS#, and ΔG# were evaluated for the reaction and discussed. The influence of catalyst, initially added product, dielectric constant, and ionic strength on the rate of reaction was also investigated. The monochlorinated substituted product along with degraded one was formed by the reaction of LNZ with FAC.

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Section: Resultsmentioning

confidence: 99%

Ag(I)‐Catalyzed Chlorination of Linezolid during Water Treatment: Kinetics and Mechanism

Kulkarni

Hanagadakar

Malladi

et al. 2018

Int J of Chemical Kinetics

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“…Transition metals can form stable complexes with polydentate ligands such as diperiodatocuprate (DPC-III) [21,22], diperiodatoargentate (DPA-III) [23], diperiodatonickelate (DPN-IV) [24], ditelluratocuprate (DTC-II) [25,26], and hexacyanoferrate (HCF-III) [27]. At first, Malatesta had synthesized DPC (III) more than a half century ago, and Panigrahi and Pathy [28] followed that method.…”

Section: Introductionmentioning

confidence: 99%

Kinetics and Mechanism of Oxidation of Carbenicillin by Copper (III) Periodate Complex in Aqueous Alkaline Medium

Sahu

Mishra

2020

Journal of Chemistry

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Kinetics and mechanism of oxidation of carbenicillin by diperiodatocuprate [DPC-III] in aqueous alkaline medium were studied spectrophotometrically at 298 K and an ionic strength of 0.10 mol·dm−3. The reaction between DPC (III) and carbenicillin in the alkaline medium showed (CRBC : DPC-III) 1 : 4 stoichiometry. The reaction products were identified by the CHNS test, FT-IR, and LC-MS spectral reports. The reaction was of pseudo-first order with respect to DPC (III) and fractional order with respect to carbenicillin as well as alkali but retarding effect with respect to periodate. Monoperiodatocuprate (MPC-III) was found to be the main active species in the alkaline medium in the form of [Cu (H2IO6) (H2O)2]. Activation and thermodynamic parameters with respect to uncatalyzed rate constants (ku) and slow step rate constant (k) as well as equilibrium constants were determined. The plausible mechanism consistent with experimental results was proposed and discussed in detail.

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“…DPA is a powerful oxidant in alkaline medium with the reduction potential of 1.74 V owing to the strong versatile nature of the two electron oxidants [25] , [26] . It has been widely used in the study of reaction kinetics and oxidation mechanism [27] , [28] . In recent years, DPA has been reported to be applied in CL for its strong oxidizability and catalytic properties [29] , [30] .…”

Section: Introductionmentioning

confidence: 99%

A chemiluminescence reagent free method for the determination of captopril in medicine and urine samples by using trivalent silver

Huang

et al. 2017

Journal of Pharmaceutical Analysis

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A novel flow-injection chemiluminescence (FI-CL) method free of CL reagent was developed for the determination of captopril based on its enhancing effect on the CL derived from diperiodatoargentate(III)-sulfuric acid system. Compared with the conventional CL system, the CL system based on trivalent silver was characterized of good selectivity for the absence of CL reagent. The CL mechanism was discussed through CL spectra and UV–vis absorption spectra. The conditions of the FI-CL system were investigated and optimized. Under the optimal conditions, the relative CL intensity was linear with the captopril concentration in the range of 0.3–15.0 μg/mL. The detection limit for captopril was 0.05 μg/mL, and the relative standard deviation (n=11) was 2.0% for 5.0 μg/mL captopril. The proposed method was applied to the analysis of captopril in tablet and human urine with the recoveries of 83.1%–112.5%, and the relative standard deviations of 0.5%–4.4%. The results obtained by the proposed method agreed well with those obtained from HPLC method. The proposed method is fast, convenient, and cost-effective for the determination of captopril in medicine and biological samples.

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Kinetics and mechanistic studies of oxidation of fluoroquionoline antibacterial agent norfloxacin by diperiodatocuprate(III) in aqueous alkaline medium

Cited by 6 publications

References 13 publications

Ag(I)‐Catalyzed Chlorination of Linezolid during Water Treatment: Kinetics and Mechanism

Ag(I)‐Catalyzed Chlorination of Linezolid during Water Treatment: Kinetics and Mechanism

Kinetics and Mechanism of Oxidation of Carbenicillin by Copper (III) Periodate Complex in Aqueous Alkaline Medium

A chemiluminescence reagent free method for the determination of captopril in medicine and urine samples by using trivalent silver

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