25. The reaction between ferric and iodide ions. Part I. Kinetics and mechanism

Fudge, A.J.; Sykes, Keith

doi:10.1039/jr9520000119

Cited by 26 publications

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“…The reduction of aquoiron(II1) by iodide ions (20,21) had been shown to be inhibited by added bromide and chloride ions. This has been explained in terms of the formation of FeX2+ (X = I, Br, C1) from the complexation of ferric ions with the halide ions, with FeX2+ being less reactive than aquoiron(II1).…”

Section: Introductionmentioning

confidence: 99%

Kinetics and mechanism of oxidation of tris-(1,10-phenanthroline)iron(II) by chlorine and bromine and of the reduction of tris-(1,10-phenanthroline)iron(III) by iodide ions

Ige¹,

Ojo²,

Olubuyide³

1979

Can. J. Chem.

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JIDE IGE, J. FOLORUNSO OJO, and OLUSEGUN OLUBUYIDE. Can. J. Chem. 57.2065Chem. 57. (1979. The rates of the oxidation of tris-(1,lO-phenanthroline)iron(II) by chlorine and bromine, and of the reduction of tris-(1,lO-phenanthroline)iron(III) by iodide ions have been measured at ionic strength I = 1.0 mol dm-3 (LiCIO,). All the reactions obey second-order rate law:The activation parameters for the reactions are: Fe(Phen)32+/Br,: AH* = (64.2 + 3.2) kJ mol-', AS* = -(24.9 + 1.5) J mol-' K-'. Fe(Phen)33+/I-:AH* = (39.8 t 2.1) kJ mol-', AS* = -(19.7 + 0.8) J mol-I K-'.The reactions of tris-(1,lO-phenanthroline)iron(II) with chlorine and bromine are unaffected by chloride, bromide, and acid. The proposed mechanism for these reactions involves a series of one-electron changes, with the species X,-(X = CI, Br) as reaction intermediates, since good linear free energy correlations for the primary step, resulting in the formation of X2-, are obtained. The reduction of tris-(1,lO-phenanthroline)iron(III) by iodide ions is catalysed by bromide and chloride ions, whereas the reduction of aquoiron(II1) by iodide ions is known to be inhibited by bromide and chloride ions. A mechanistic interpretation of this observation is suggested. [Traduit par le journal]

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Section: Introductionmentioning

confidence: 99%

Kinetics and mechanism of oxidation of tris-(1,10-phenanthroline)iron(II) by chlorine and bromine and of the reduction of tris-(1,10-phenanthroline)iron(III) by iodide ions

Ige¹,

Ojo²,

Olubuyide³

1979

Can. J. Chem.

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“…Liquid water helps to mobilize sparingly soluble IO 3 − and also iron ions, which facilitates the photochemical production of peroxides either directly ( 43 ) or by using the iron ions ( 44 ). Iodate might then be reduced through reaction with the iron ions ( 45 , 46 ), by H 2 O 2 ( 47 ), by nitrite ( 48 ) photosensitized reactions ( 37 , 38 ), or by numerous other species ( 49 ). Iodate reduction is thermodynamically favored over nitrate reduction and might serve to suppress renoxification.…”

Section: Resultsmentioning

confidence: 99%

Ozone depletion due to dust release of iodine in the free troposphere

et al. 2021

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“…Earlier kinetic studies on reduction of Fe(III) center by iodide had been reported which showed a variety in the dependence of rate on [iodide]. Fudge and Sykes [36] reported second-order dependence and so did Lawrence and Ellis [37]. The latter workers, unlike the former ones, proposed a mechanism operating via an outer sphere complex between Fe 3+ and iodide ions.…”

Section: Kinetics and Mechanismmentioning

confidence: 95%

Kinetics and mechanism of oxidation of iodide with a (μ‐oxo)diiron(III,III) complex in weakly acidic media

Mukherjee

Dhar

Banerjee

2005

Int J of Chemical Kinetics

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2+ (2a) coexist in rapid equilibria in the range pH 4. 23-5.35 in the presence of excess phenanthroline (pK a1 = 3.71 ± 0.03, pK a2 = 5.28 ± 0.07). The solution reacts quantitatively with I − to produce [Fe(phen) 3 ] 2+ and I 2 . Only 1 but none of its hydrolytic derivatives is kinetically active. Both inner and outer sphere pathways operate. The observed rate constants show second-order dependence on the concentration of iodide, while the dependence on [H + ] is complex in nature. Added Cl − inhibits the formation of adduct with I − and thus retards the rate of inner sphere path, leading to a rate saturation at high [Cl − ], where only the outer sphere mechanism is active. Kinetic data indicate that simultaneous presence of two I − in the vicinity of diiron core is necessary for the reduction of 1. C 2005 Wiley Periodicals, Inc. Int J Chem Kinet 37: [737][738][739][740][741][742][743] 2005

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25. The reaction between ferric and iodide ions. Part I. Kinetics and mechanism

Cited by 26 publications

References 0 publications

Kinetics and mechanism of oxidation of tris-(1,10-phenanthroline)iron(II) by chlorine and bromine and of the reduction of tris-(1,10-phenanthroline)iron(III) by iodide ions

Kinetics and mechanism of oxidation of tris-(1,10-phenanthroline)iron(II) by chlorine and bromine and of the reduction of tris-(1,10-phenanthroline)iron(III) by iodide ions

Ozone depletion due to dust release of iodine in the free troposphere

Kinetics and mechanism of oxidation of iodide with a (μ‐oxo)diiron(III,III) complex in weakly acidic media

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