Kinetics and Mechanism of Potassium Persulfate Decomposition in Aqueous Solutions Studied by a Gasometric Method

Beylerian, N. M.; Vardanyan, Louisa R.; Harutyunyan, Romik S.; Vardanyan, Razmik L.

doi:10.1002/1521-3935(20020101)203:1<212::aid-macp212>3.0.co;2-3

Cited by 42 publications

(26 citation statements)

References 16 publications

(29 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The free radical formation is directly linked with the rate of both the polymerization and decomposition of KPS under different pH conditions in the reaction buffer. Beylerian et al [21] reported that an acidic condition of KPS advances the heterolysis of the HS 2 O 8 − anion, which is completed with the formation of SO 4 , whereas a basic condition completes the formation of the SO 4 − free anion radical by inducing the hemolytic decomposition of KPS. Therefore, the negative charges originated from the anionic sulfate functional groups (SO 4 − ) were functionalized in the presence of sodium tetraborate (Fig.…”

Section: Resultssupporting

confidence: 70%

ZnO nanosphere fabrication using the functionalized polystyrene nanoparticles for dye-sensitized solar cells

Jung

Yun

Kim

et al. 2010

Electrochimica Acta

View full text Add to dashboard Cite

Section: Resultssupporting

confidence: 70%

ZnO nanosphere fabrication using the functionalized polystyrene nanoparticles for dye-sensitized solar cells

Jung

Yun

Kim

et al. 2010

Electrochimica Acta

View full text Add to dashboard Cite

“…At basic pH, most of the initiator is in the form of the persulfate dianion S 2 O 2À 8 , while the monoanion, HS 2 O À 8 is more prevalent at pH 4.5. [25] The dianion does not easily react at the cathode because of its strong negative charge, and the polymerization slows down accordingly. For this reason, the film thickness obtained at pH 8.5 is much below the one obtained in acids ( Figure 2E and F).…”

Section: Resultsmentioning

confidence: 99%

Electrochemically Induced RAFT Polymerization of Thermoresponsive Hydrogel Films: Impact on Film Thickness and Surface Morphology

Bünsow¹,

Mänz²,

Vana³

et al. 2010

Macro Chemistry & Physics

View full text Add to dashboard Cite

Thin hydrogel films of the thermoresponsive polymer poly(N‐isopropylacrylamide) (pNIPAm) were prepared by electrochemically triggered reversible addition‐fragmentation chain transfer (RAFT) polymerization. Two different RAFT agents were employed, which work in either acidic or basic solution. In both cases, addition of RAFT agents had an influence on the thickness and the surface morphology of the films. At low concentration, the polymerization efficiency increased. At high concentration, the efficiency decreased at acidic pH, while it remained constant under basic conditions. Neither RAFT agent displayed electrochemical activity on its own, but they did modify the electrochemical behavior of the initiator. The addition of RAFT agent strongly enhances the homogeneity of the hydrogel surfaces, which presumably is due to a reduced amount of microgel formation.

show abstract

“…Traces of dioxygen can be generated from peroxodisulfate14c or be present as adventitious air, thus explaining the formation ( via the peroxyl radical) of cyclic alcohols and ketones as by‐products. Alkyl hydroperoxide (ROOH) is a plausible intermediate, derived from ROO .…”

Section: Resultsmentioning

confidence: 99%

Metal‐Free and Copper‐Promoted Single‐Pot Hydrocarboxylation of Cycloalkanes to Carboxylic Acids in Aqueous Medium

Kirillova¹,

Kirillov²,

Pombeiro³

2009

Adv Synth Catal

View full text Add to dashboard Cite

A simple and effective method for the transformation, under mild conditions and in aqueous medium, of various cycloalkanes (cyclopentane, cyclohexane, methylcyclohexane, cis-and trans-1,2-dimethylcyclohexane, cycloheptane, cyclooctane and adamantane) into the corresponding cycloalkanecarboxylic acids bearing one more carbon atom, is achieved. This method is characterized by a singlepot, low-temperature hydrocarboxylation reaction of the cycloalkane with carbon monoxide, water and potassium peroxodisulfate in water/acetonitrile medium, proceeding either in the absence or in the presence of a metal promoter. The influence of various reaction parameters, such as type and amount of metal promoter, solvent composition, temperature, time, carbon monoxide pressure, oxidant and cycloalkane, is investigated, leading to an optimization of the cyclohexane and cyclopentane carboxylations. The highest efficiency is observed in the systems promoted by a tetracopper(II) triethanolaminate-derived complex, which also shows different bond and stereoselectivity parameters (compared to the metalfree systems) in the carboxylations of methylcyclohexane and stereoisomeric 1,2-dimethylcyclohexanes. A free radical mechanism is proposed for the carboxylation of cyclohexane as a model substrate, involving the formation of an acyl radical, its oxidation and consequent hydroxylation by water. Relevant features of the present hydrocarboxylation method, besides the operation in aqueous medium, include the exceptional metal-free and acid-solvent-free reaction conditions, a rare hydroxylating role of water, substrate versatility, low temperatures (ca. 50 8C) and a rather high efficiency (up to 72% carboxylic acid yields based on cycloalkane).

show abstract

Kinetics and Mechanism of Potassium Persulfate Decomposition in Aqueous Solutions Studied by a Gasometric Method

Cited by 42 publications

References 16 publications

ZnO nanosphere fabrication using the functionalized polystyrene nanoparticles for dye-sensitized solar cells

ZnO nanosphere fabrication using the functionalized polystyrene nanoparticles for dye-sensitized solar cells

Electrochemically Induced RAFT Polymerization of Thermoresponsive Hydrogel Films: Impact on Film Thickness and Surface Morphology

Metal‐Free and Copper‐Promoted Single‐Pot Hydrocarboxylation of Cycloalkanes to Carboxylic Acids in Aqueous Medium

Contact Info

Product

Resources

About