Conductometric Pulse Radiolysis Study on the Reaction of the Solvated Electron with 5-Bromouracil in Aqueous Solutions at Different pH Values

Wagner, Burkhard O.; Klever, Herbert; Schulte‐Frohlinde, D.

doi:10.1515/znb-1974-1-227

Cited by 13 publications

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Decay and protonation of the 5‐chlorouracil radical anion in aqueous solutions

Wagner¹,

Schulte‐Frohlinde²

1975

Ber Bunsenges Phys Chem

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.F-C'ii1~~ruruc.ilrodikol~inion J Frrie Rodikale J Pulsrrrdiolyse / Rruk/ionskine/ik J Sf ralilenchrrnicThe pulse radiolysis of 5-chlorouracil (CIUr) in airfree aqueous solution has been investigated. The rate constants for the reactions of thc forination and the decay of the 5-chlorouracil radical anion presented in the following reaction scheme have been measured at 21 C:CIUrH' 3 chlorine containing products and 4.7 (unbuffered), -Under pulse conditions the yield of chloride was G(CI-) = 2.7 f 0.2/100eV in neutral and alcaline solutions, but was lower in acidic solutions (pH < 5 ) and at higher dose rates. This result was interpreted in terms of reaction (4).

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Decay and protonation of the 5‐chlorouracil radical anion in aqueous solutions

Wagner¹,

Schulte‐Frohlinde²

1975

Ber Bunsenges Phys Chem

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Pulse radiolysis of aqueous solutions of acetic acid 2‐hydroxyethyl ester. Fast elimination of acetic acid from a primary radical

Matsushige

Koltzenburg

Schulte‐Frohlinde

1975

Ber Bunsenges Phys Chem

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The reaction of OH radicals with acetic acid 2‐hydroxyethyl ester, (1), in aqueous solutions has been studied. A rate constant of k(OH + 1) = 8.5 · 108 M−1 s−1 was obtained. The transients a few μs after pulse consist of ∼83% formylmethyl radicals, CH2CHO, the remainder being mainly CH3C(O)OCHCH2OH radicals, (3). γ‐radiolysis of 1 in N2O saturated aqueous solutions led to G(acetic acid)=5.0 without contribution of a chain reaction. It is concluded that the OH attack on 1 leads mainly to the redical CH3C(O)OCH2CHOH, (2), which undergoes a fast fragmentation into acetic acid and the formylmethyl radical: A lower limit of the rate constant of this reaction, at 20°C, κ 5·105s−, was derived from pulse radiolysis studies and an upper limit of κ ≤ 5·106s−1 was estimated from scavenging experiments with oxygen under Co60‐γ‐irradiation. At higher concentrations of 1, and/or higher temperatures CH2CHO attacks 1, leading to a chain decomposition of 1 yielding acetic acid and acetaldehyde. Succinic aldehyde was identified as a product of the dimerization of CH2CHO.

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ChemInform Abstract: CONDUCTOMETRIC PULSE RADIOLYSIS STUDY ON THE REACTION OF THE SOLVATED ELECTRON WITH 5‐BROMOURACIL IN AQUEOUS SOLUTIONS AT DIFFERENT PH VALUES

Wagner¹,

Klever²,

Schulte‐Frohlinde³

1974

Chemischer Informationsdienst

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Conductometric Pulse Radiolysis Study on the Reaction of the Solvated Electron with 5-Bromouracil in Aqueous Solutions at Different pH Values

Abstract: B u r k h a r d O . W a g n e r , H e r b e r t K l e v e r , a n d D i e t r i c h S c h u l t e -F r o h l i n d eI n s tit u t fü r S tra h le n c h e m ie im M a x -P la n c k -In s titu t fu r K o h len fo rsch u n g , M ülheim a. d. R u h r

Cited by 13 publications

References 0 publications

Decay and protonation of the 5‐chlorouracil radical anion in aqueous solutions

Decay and protonation of the 5‐chlorouracil radical anion in aqueous solutions

Pulse radiolysis of aqueous solutions of acetic acid 2‐hydroxyethyl ester. Fast elimination of acetic acid from a primary radical

ChemInform Abstract: CONDUCTOMETRIC PULSE RADIOLYSIS STUDY ON THE REACTION OF THE SOLVATED ELECTRON WITH 5‐BROMOURACIL IN AQUEOUS SOLUTIONS AT DIFFERENT PH VALUES

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