Journal article
Reactions of OH Radicals with Tris (1,10-Phenanthroline) Iron (II) Studied by Pulse Radiolysis
The reaction of OH radicals with aqueous tris(1,10-phenanthroline)iron(II) leads to the formation of an adduct, which exhibits a broad absorption band at rmpH = 6, λmax = 460 nm, and epsilon (Porson)460 = 6700 (molar, decadic, 1 mol−1 cm−1). The rate of formation of the adduct is first order in complex concentration with a bimolecular rate constant Image independent of pH in the range pH 3–11.
The adduct decays by mixed-order kinetics, but at 310 nm a second-order formation of a decay product can be directly observed. The reaction of OH radicals with aqueous 1,10-phenanthroline leads also to the formation of an adduct which absorbs in the whole visible region with a maximum at 425 nm and ε425 = 2612 (molar, decadic, 1 mol−1 cm−1) in neutral solution.
The adduct exhibits a red shift in acidic and alkaline media. The formation is first order in 1,10-phenanthroline with a bimolecular rate constant Image The reaction of OH radicals with aqueous tris(1,10-phenanthroline)iron(II) leads to the formation of an adduct, which exhibits a broad absorption band at rmpH = 6, λmax = 460 nm, and epsilon (Porson)460 = 6700 (molar, decadic, 1 mol−1 cm−1).
The rate of formation of the adduct is first order in complex concentration with a bimolecular rate constant Image independent of pH in the range pH 3–11. The adduct decays by mixed-order kinetics, but at 310 nm a second-order formation of a decay product can be directly observed. The reaction of OH radicals with aqueous 1,10-phenanthroline leads also to the formation of an adduct which absorbs in the whole visible region with a maximum at 425 nm and ε425 = 2612 (molar, decadic, 1 mol−1 cm−1) in neutral solution.
The adduct exhibits a red shift in acidic and alkaline media. The formation is first order in 1,10-phenanthroline with a bimolecular rate constant Image at pH = 6; the rate of formation is pH dependent. The adduct decays according to second-order kinetics leading to the formation of a product that exhibits the presence of an additional functional group.
A similar product, determined to have pKcurly equals, succeeds4 > ṡ;2 and pK2curly equals, succeeds8 > ṡ;1, has been isolated after γ-radiolysis of 1,10-phenanthroline.
Language: | English |
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Year: | 1976 |
Pages: | 425-432 |
ISSN: | 00207055 and 18781179 |
Types: | Journal article |
DOI: | 10.1016/0020-7055(76)90004-8 |