Radiolysis of monocrystalline, liquid and aqueous solutions of methane sulphonic acid

International Journal for Radiation Physics and Chemistry Pub Date : 1976-01-01 DOI:10.1016/0020-7055(76)90036-X

T.E. Eriksen, J. Lind, T. Gillbro

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引用次数: 1

Abstract

A study of the radiolysis of monocrystalline, liquid and aqueous solutions of methane sulphonic acid is reported. E.S.R.-measurements on γ-irradiated single crystals show that two radicals ·CH₂SO₂(OH) and CH₃ŻSO₂(OH)⁻ are formed. Sulphonic acid-water mixtures were investigated by pulse radiolysis. A short-lived transient absorption with maximum at 450 nm is assigned to the radical ion CH₃ŻSO₂(OH)⁻ (ϵ = 1740 dm³ mol⁻¹ cm⁻¹). Two longer-lived transient absorptions at 263 and 347 nm in concentrated solution were shifted to 242 and 332 nm respectively with increasing water concentration.

The 242/263 nm absorption is ascribed to the ·CH₂SO₃⁻ radical and its protonated form and the 332/347 nm absorption to the CH₃SO₂· radical formed by the decomposition of the CH₃ŻSO₂(OH)⁻ radical ion. The interpretation of E.S.R. and optical spectra is based on the assumption of a hydrogen bonding structure of the sulphonic acid.

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甲烷磺酸单晶、液体和水溶液的辐射分解

本文报道了甲烷磺酸的单晶、液、水溶液的辐射分解研究。在γ辐照单晶上的esr测量表明，形成了两个自由基·CH2SO2(OH)和CH3ŻSO2(OH)−。用脉冲辐射解法研究了磺酸-水混合物。自由基离子CH3ŻSO2(OH)−(ε = 1740 dm3 mol−1 cm−1)在450nm处有一个短暂的瞬态吸收。在浓溶液中，随着水浓度的增加，在263和347 nm处的两个较长时间的瞬时吸收分别转移到242和332 nm处。在242/263 nm的吸收是由·CH2SO3 -自由基及其质子化形式引起的，而在332/347 nm的吸收是由CH3ŻSO2(OH) -自由基离子分解形成的CH3SO2·自由基引起的。在假设磺酸具有氢键结构的基础上，解释了电磁共振和光谱。

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International Journal for Radiation Physics and Chemistry

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