Pulse radiolytic investigations of peroxy radicals produced from 2-propanol and methanol

Yael Ilan; Joseph Rabani; Arnim Henglein

doi:10.1021/j100555a008

Pulse radiolytic investigations of peroxy radicals produced from 2-propanol and methanol

Yael Ilan, Joseph Rabani^*, Arnim Henglein

^*Corresponding author for this work

Institute of Chemistry

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Abstract

The reactions of peroxy radicals produced from 2-propanol and from methanol were investigated. At pH 3 the peroxy radicals were found to decay by both second- and first-order processes: O₂CH₂OH → HO₂ + CH₂O, k ≅ 5 × 10² s^-1; O₂COH(CH₃)₂ → HO₂ + (CH₃)₂CO, k = (700 ± 150) s^-1; 2O₂CH₂OH → products, 2k = (3 ± 1) × 10⁸ M^-1 s^-1; 2O₂COH(CH₃)₂ → products, 2k = (1.1 ± 0.2) × 10⁷ M^-1 s^-1. The reactivity of O₂C(OH)(CH₃)₂ toward OH^- and HPO₄^2- ions, resulting in the ionization of the peroxy radicals, and the subsequent formation of O₂^-, was studied. A rate constant k_{((CH3)2C(OH)(O2)+OH-→(CH3)2C(O-)(O2)+H2O)} = (5.2 ± 1) × 10⁹ M^-1 s^-1 was measured. The similar reaction with HPO₄^2- was found to have a rate constant of (1.07 ± 0.15) × 10⁷ M^-1 s^-1. All results are reported for an ionic strength of 0.1 M.

Original language	English
Pages (from-to)	1558-1562
Number of pages	5
Journal	Journal of Physical Chemistry
Volume	80
Issue number	14
DOIs	https://doi.org/10.1021/j100555a008
State	Published - 1976

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title = "Pulse radiolytic investigations of peroxy radicals produced from 2-propanol and methanol",

abstract = "The reactions of peroxy radicals produced from 2-propanol and from methanol were investigated. At pH 3 the peroxy radicals were found to decay by both second- and first-order processes: O2CH2OH → HO2 + CH2O, k ≅ 5 × 102 s-1; O2COH(CH3)2 → HO2 + (CH3)2CO, k = (700 ± 150) s-1; 2O2CH2OH → products, 2k = (3 ± 1) × 108 M-1 s-1; 2O2COH(CH3)2 → products, 2k = (1.1 ± 0.2) × 107 M-1 s-1. The reactivity of O2C(OH)(CH3)2 toward OH- and HPO42- ions, resulting in the ionization of the peroxy radicals, and the subsequent formation of O2-, was studied. A rate constant k((CH3)2C(OH)(O2)+OH-→(CH3)2C(O-)(O2)+H2O) = (5.2 ± 1) × 109 M-1 s-1 was measured. The similar reaction with HPO42- was found to have a rate constant of (1.07 ± 0.15) × 107 M-1 s-1. All results are reported for an ionic strength of 0.1 M.",

author = "Yael Ilan and Joseph Rabani and Arnim Henglein",

year = "1976",

doi = "10.1021/j100555a008",

language = "אנגלית",

volume = "80",

pages = "1558--1562",

journal = "Journal of Physical Chemistry",

issn = "0022-3654",

publisher = "American Chemical Society",

number = "14",

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T1 - Pulse radiolytic investigations of peroxy radicals produced from 2-propanol and methanol

AU - Ilan, Yael

AU - Rabani, Joseph

AU - Henglein, Arnim

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N2 - The reactions of peroxy radicals produced from 2-propanol and from methanol were investigated. At pH 3 the peroxy radicals were found to decay by both second- and first-order processes: O2CH2OH → HO2 + CH2O, k ≅ 5 × 102 s-1; O2COH(CH3)2 → HO2 + (CH3)2CO, k = (700 ± 150) s-1; 2O2CH2OH → products, 2k = (3 ± 1) × 108 M-1 s-1; 2O2COH(CH3)2 → products, 2k = (1.1 ± 0.2) × 107 M-1 s-1. The reactivity of O2C(OH)(CH3)2 toward OH- and HPO42- ions, resulting in the ionization of the peroxy radicals, and the subsequent formation of O2-, was studied. A rate constant k((CH3)2C(OH)(O2)+OH-→(CH3)2C(O-)(O2)+H2O) = (5.2 ± 1) × 109 M-1 s-1 was measured. The similar reaction with HPO42- was found to have a rate constant of (1.07 ± 0.15) × 107 M-1 s-1. All results are reported for an ionic strength of 0.1 M.

AB - The reactions of peroxy radicals produced from 2-propanol and from methanol were investigated. At pH 3 the peroxy radicals were found to decay by both second- and first-order processes: O2CH2OH → HO2 + CH2O, k ≅ 5 × 102 s-1; O2COH(CH3)2 → HO2 + (CH3)2CO, k = (700 ± 150) s-1; 2O2CH2OH → products, 2k = (3 ± 1) × 108 M-1 s-1; 2O2COH(CH3)2 → products, 2k = (1.1 ± 0.2) × 107 M-1 s-1. The reactivity of O2C(OH)(CH3)2 toward OH- and HPO42- ions, resulting in the ionization of the peroxy radicals, and the subsequent formation of O2-, was studied. A rate constant k((CH3)2C(OH)(O2)+OH-→(CH3)2C(O-)(O2)+H2O) = (5.2 ± 1) × 109 M-1 s-1 was measured. The similar reaction with HPO42- was found to have a rate constant of (1.07 ± 0.15) × 107 M-1 s-1. All results are reported for an ionic strength of 0.1 M.

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Pulse radiolytic investigations of peroxy radicals produced from 2-propanol and methanol

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