UV–Vis spectrophotometric studies of self-oxidation/dissociation of quaternary ammonium permanganates (QAP) – impact of solvent polarity

Bank, Suraj Prakash; Guru, Partha Sarathi; Dash, Sukalyan

doi:10.1016/j.saa.2015.01.031

Cited by 3 publications

(4 citation statements)

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“…36 Oxidation of various alkenes in different organic solvents by using cetyltrimethylammonium permanganate CTAP was previously studied by Dash and Mishra. 40,41 They found that as CTAP exhibits both hydrophobic interaction and electrostatic effect, the reactant and the substrate are brought to vicinity and the alkene oxidation is enhanced. 36 Furthermore, the same authors detected a self-oxidation process of CTAP in a CHCl 3 medium where CTAP exists as a tight ion pair.…”

Section: Scheme 1 Progress Of the Synthesis Protocolmentioning

confidence: 99%

Theoretical and Practical Approach of Soft Template Synthesis for the Preparation of MnO₂ Supercapacitor Electrode

2017

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Mesoporous manganese dioxide was successfully synthesized by alkene oxidation with permanganate in soft template medium. Four linear and three cyclic alkenes have been used as reactants to show their impact on the MnO 2 particles microstructure (specially the pore volume), on their agglomeration, and hence on their electrochemical performances as positive electrode materials in supercapacitors. The reaction proceeds via an intermediate product step, a manganate(V) cyclic diester, capable of producing aggregates. Aggregate macromolecular characteristics, such as intrinsic viscosity [η], molecular weight M, aggregation number N, and radius R, depend on the alkene employed. The role of CTAP as phase-transfer agent and as templating agent for MnO 2 synthesis when associated with alkene is also confirmed. This first study allowed the proposition of a structure for the aggregates (called model B in the text). The electrochemical performances of the manganese oxides were subsequently determined with aqueous, environmentally friendly K 2 SO 4 electrolyte. Suitable performances, in terms of high specific capacitances (>150 F•g −1 ) are provided by oxides prepared by employing bulky cyclic or long-chain linear alkenes. Asymmetric devices AC∥MnO 2 with one of the mesoporous manganese oxide as the positive electrode, obtained from the oxidation of 1-octadecene, and activated carbon (AC) as the negative electrode yield suitable energy density of 18.2 Wh•kg −1 and a power density of 0.2 kW•kg −1 for electrochemical capacitor purposes. Finally, this particular device, cycled under galvanostatic regimes, shows a high-capacitance retention (81.2% after 10000 cycles). Therefore, this particular soft template method is suitable for the preparation of supercapacitor electrodes.

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Section: Scheme 1 Progress Of the Synthesis Protocolmentioning

confidence: 99%

Theoretical and Practical Approach of Soft Template Synthesis for the Preparation of MnO₂ Supercapacitor Electrode

2017

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“…The measurements were done for 60 min in each case at 5 min time interval. First order rate constants ( k ψ ) were calculated at a standard λ max of 528 nm using eq . , where OD 0 = optical density at “0” time and OD t = optical density at time “ t ”. The results reported are an average of three runs with an error of (±) 6.0%.…”

Section: Methodsmentioning

confidence: 99%

“…However, formation of tight ion pair between CTA + and permanganate ions of CTAP present in organic media also invokes a self-oxidation, thus diminishing its oxidizing capability to some extent. 8,9 Recently, we have reported the inclusion complexation of CTAP with β-CD producing a new functionalized oxidant (β-CD-CTAP) in water medium. 10 Absence of tight ion pairing in this medium makes CTAP more stable compared to in any of the organic media.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Since the lipopathic oxidant is also charged, both hydrophobic and electrostatic interactions bring the oxidant and the substrate into proximity, thereby facilitating the oxidation reaction. However, formation of tight ion pair between CTA + and permanganate ions of CTAP present in organic media also invokes a self-oxidation, thus diminishing its oxidizing capability to some extent. , …”

Section: Introductionmentioning

confidence: 99%

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Green and Efficient: In Situ Oxidation Kinetics of Some Tailor-Made γ-Styrylpyridinium Dyes in Aqueous Medium Using the β-CD-CTAP Complex

Bank

Guru

Dash

2015

Ind. Eng. Chem. Res.

Self Cite

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β-CD-CTAP (β-cyclodextrin-cetyltrimethylammonium permanganate) complex, a novel functionalized oxidant, has been used to investigate the oxidation kinetics of some water-soluble γ-styrylpyridinium dyes containing a trans-double bond. In absence of acid or base catalysis and in neutral medium, the in situ oxidation process successfully demonstrates the potential of β-CD-CTAP complex as a green oxidant, in contrast to earlier reports on permanganate reagents. β-CD lends a supramolecular catalysis during the reaction due to its noncovalent interaction with CTAP. Substituent effect, reaction coefficient, deuterium isotope effect, effect of β-CD concentration, and the values of thermodynamic parameters help in proposing suitable mechanisms for the oxidation process. Proportionate variation of the rate constant values with the concentration of CTAP demonstrates the absence of any reverse micellization phenomenon of the oxidant, in contrast to earlier findings.

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Cr(VI) Oxidation of Cholesterol—A Kinetic Study Using N-Cetylpicolinium Dichromates, A Class of Novel Phase Transfer Oxidants

Priyadarshini

Guru

et al. 2019

Kinet Catal

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UV–Vis spectrophotometric studies of self-oxidation/dissociation of quaternary ammonium permanganates (QAP) – impact of solvent polarity

Cited by 3 publications

References 29 publications

Theoretical and Practical Approach of Soft Template Synthesis for the Preparation of MnO₂ Supercapacitor Electrode

Theoretical and Practical Approach of Soft Template Synthesis for the Preparation of MnO₂ Supercapacitor Electrode

Green and Efficient: In Situ Oxidation Kinetics of Some Tailor-Made γ-Styrylpyridinium Dyes in Aqueous Medium Using the β-CD-CTAP Complex

Cr(VI) Oxidation of Cholesterol—A Kinetic Study Using N-Cetylpicolinium Dichromates, A Class of Novel Phase Transfer Oxidants

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UV–Vis spectrophotometric studies of self-oxidation/dissociation of quaternary ammonium permanganates (QAP) – impact of solvent polarity

Cited by 3 publications

References 29 publications

Theoretical and Practical Approach of Soft Template Synthesis for the Preparation of MnO2 Supercapacitor Electrode

Theoretical and Practical Approach of Soft Template Synthesis for the Preparation of MnO2 Supercapacitor Electrode

Green and Efficient: In Situ Oxidation Kinetics of Some Tailor-Made γ-Styrylpyridinium Dyes in Aqueous Medium Using the β-CD-CTAP Complex

Cr(VI) Oxidation of Cholesterol—A Kinetic Study Using N-Cetylpicolinium Dichromates, A Class of Novel Phase Transfer Oxidants

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Theoretical and Practical Approach of Soft Template Synthesis for the Preparation of MnO₂ Supercapacitor Electrode

Theoretical and Practical Approach of Soft Template Synthesis for the Preparation of MnO₂ Supercapacitor Electrode