Pulse radiolytic investigations of peroxy radicals in aqueous solutions of acetate and glycine

Sara Abramovitch; Joseph Rabani

doi:10.1021/j100555a009

Pulse radiolytic investigations of peroxy radicals in aqueous solutions of acetate and glycine

Sara Abramovitch, Joseph Rabani^*

^*Corresponding author for this work

Institute of Chemistry

Research output: Contribution to journal › Article › peer-review

44 Scopus citations

Abstract

Aqueous solutions of glycine and acetate have been pulse irradiated in the presence of O₂. Radicals produced from these compounds by H abstraction reacted with O₂ to form peroxy radicals. The reaction rate constants k_(RH+O2) = (2.1 ± 0.3) × 10⁹ and ≃ 1 × 10⁹ M^-1 s^-1 were measured for RH = acetate radicals and glycine radicals, at pH 8.2 and 7.9, respectively. The peroxyacetate radicals decay by a second-order reaction, k = (6.5 ± 1) × 10⁸ M^-1 s^-1 at both pH 5.7 and 8.2. The peroxyglycine radicals produce O₂^- by a first-order process, k = (1.5 ± 0.3) × 10⁵ s^-1 at pH 7.9. Evidence for the formation of O₂^- from peroxy glycine radicals is presented.

Original language	English
Pages (from-to)	1562-1565
Number of pages	4
Journal	Journal of Physical Chemistry
Volume	80
Issue number	14
DOIs	https://doi.org/10.1021/j100555a009
State	Published - 1976

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abstract = "Aqueous solutions of glycine and acetate have been pulse irradiated in the presence of O2. Radicals produced from these compounds by H abstraction reacted with O2 to form peroxy radicals. The reaction rate constants k(RH+O2) = (2.1 ± 0.3) × 109 and ≃ 1 × 109 M-1 s-1 were measured for RH = acetate radicals and glycine radicals, at pH 8.2 and 7.9, respectively. The peroxyacetate radicals decay by a second-order reaction, k = (6.5 ± 1) × 108 M-1 s-1 at both pH 5.7 and 8.2. The peroxyglycine radicals produce O2- by a first-order process, k = (1.5 ± 0.3) × 105 s-1 at pH 7.9. Evidence for the formation of O2- from peroxy glycine radicals is presented.",

author = "Sara Abramovitch and Joseph Rabani",

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T1 - Pulse radiolytic investigations of peroxy radicals in aqueous solutions of acetate and glycine

AU - Abramovitch, Sara

AU - Rabani, Joseph

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N2 - Aqueous solutions of glycine and acetate have been pulse irradiated in the presence of O2. Radicals produced from these compounds by H abstraction reacted with O2 to form peroxy radicals. The reaction rate constants k(RH+O2) = (2.1 ± 0.3) × 109 and ≃ 1 × 109 M-1 s-1 were measured for RH = acetate radicals and glycine radicals, at pH 8.2 and 7.9, respectively. The peroxyacetate radicals decay by a second-order reaction, k = (6.5 ± 1) × 108 M-1 s-1 at both pH 5.7 and 8.2. The peroxyglycine radicals produce O2- by a first-order process, k = (1.5 ± 0.3) × 105 s-1 at pH 7.9. Evidence for the formation of O2- from peroxy glycine radicals is presented.

AB - Aqueous solutions of glycine and acetate have been pulse irradiated in the presence of O2. Radicals produced from these compounds by H abstraction reacted with O2 to form peroxy radicals. The reaction rate constants k(RH+O2) = (2.1 ± 0.3) × 109 and ≃ 1 × 109 M-1 s-1 were measured for RH = acetate radicals and glycine radicals, at pH 8.2 and 7.9, respectively. The peroxyacetate radicals decay by a second-order reaction, k = (6.5 ± 1) × 108 M-1 s-1 at both pH 5.7 and 8.2. The peroxyglycine radicals produce O2- by a first-order process, k = (1.5 ± 0.3) × 105 s-1 at pH 7.9. Evidence for the formation of O2- from peroxy glycine radicals is presented.

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Pulse radiolytic investigations of peroxy radicals in aqueous solutions of acetate and glycine

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