Kinetics of the oxidation of [N-(2-hydroxyethyl)-ethylene-diamine-N,N?,N?-triacetato]cobalt(II) by N-bromosuccinimide

The kinetics of oxidation of ferrocyanide by N-bromosuccinimide (NBS) has been studied spectrophotometrically in aqueous acidic medium over temperature range 20-35°C, pH = 2.8-4.3, and ionic strength = 0.10-0.50 mol dm -3 over a range of [Fe 2+ ] and [NBS]. The reaction exhibited first order dependence on both reactants and increased with increasing pH, [NBS], and [Fe 2+ ]. The rate of oxidation obeys the rate law: d[Fe 3+ ]/ dt = [Fe(CN) 6 ] 4-[HNBS + ]/(k 2 + k 3 /[H + ]). An outersphere mechanism has been proposed for the oxidation pathway of both protonated and deprotonated ferrocyanide species. Addition of both succinimide and mercuric acetate to the reaction mixture has no effect on the reaction rate under the experimental conditions. Mercuric acetate was added to the reaction mixture to act as scavenger for any bromide formed to ensure that the oxidation is entirely due to NBS oxidation.

Section: Introductionsupporting

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Kinetics and mechanism of oxidation of ferrocyanide by N-bromosuccinimide in aqueous acidic solution

Abdel-Hady

2008

“…Kinetics of oxidation of [Co(EDTA)] 2-and [Co(HEDTA)] -(HE-DTA=N-(2-hydroxyethyl)-ethylene-diamine-N,N 0 ,N 0 ,tri-acetate) by NBS have been studied. The oxidation both processes were found to proceed via the formation of initial cobalt(III) products, which are then slowly converted to the final cobalt(III) products with an inner-sphere mechanism [11,12]. Kinetic studies of the oxidation of [Cr(H 2 O) 6 ] 3?…”

Section: Introductionmentioning

confidence: 98%

“…NBS has been used as an oxidizing agent for some transition metal complexes [9][10][11][12][13][14][15]. The kinetics of oxidation of aqua(2-aminomethyl-pyridine)chromium(III) by NBS [9] to yield chromium(VI) has been studied.…”

Section: Introductionmentioning

confidence: 99%

Kinetics and mechanism of oxidation of N,N-bis(salicylaldehyde-1,2-diaminoethane) cobalt(II) by N-bromosuccinimide in aqueous acidic medium

Abdel-Hady

Farag

Abu-Khadra

2010

The kinetics of oxidation of N,N-bis(salicylaldehyde-1,2-diaminoethane) cobalt(II) complex by N-bromosuccinimide (NBS) in aqueous acid and H 2 O-MeOH solvent mixtures were studied spectrophotometrically over the 20-40°C range, 0.1-0.5 mol dm -3 ionic strength, 2.2-2.8 pH range and 0-40 wt% MeOH-H 2 O solvent mixtures for a range of NBS and complex concentrations. The rate shows first-order dependence on both [NBS] and [complex] and decreases with pH over the range studied. The protonated form of N-bromosuccinimide was identified as the main reactive species. An inner-sphere mechanism involving free radicals is proposed.

“…N-bromosuccinimide (NBS) has been used on a large scale as a brominating and oxidizing agent for organic compounds, but its use to oxidize inorganic compounds and metal complexes has, until recently, received little attention [1][2][3][4][5][6][7][8][9][10][11][12][13]. 2 ] -(NTA = nitrilotriacetate) by NBS have been studied in aqueous medium [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Kinetics and mechanism of oxidation of aquaethylenediaminetetraacetatocobaltate(II) by N-bromosuccinimide in aqueous acidic solution

Eljack

Sulfab

2010