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Radiolysis of p-benzoquinone solutions

Authors:	A A Al-Suhybani G Hughes

Institution:	(1) Chemistry Department, Science College, King Saud University, (Saudi Arabia);(2) Chemistry Department, University of Liverpool, Liverpool, (UK)

Abstract:	The products of the continuous radiolysis of p-benzoquinone (Q) at different concentrations of H₂SO₄, Q and Cl^– are p-hydroquinone (H₂Q) and 2-hydroxy-p-benzoquinone (2-Q-OH). In the presence of some alcohols, a carbonyl compound is produced in addition to H₂Q and 2-Q-OH. The dependence of G values of the products on these factors is described. The material balance between G(-Q) and G(H₂Q)+G(2-Q-OH) is maintained. The experimental results indicate the occurrence of the following reaction: $H\dot Q + Cl_2 \to \to Q + H^ + + 2Cl^ -$ . By competition studies, it was possible to evaluate the rate coefficients for the following reactions: $SO_4^{\mathop \cdot \limits^ - } + Q\xrightarrow{{H_2 O}}HSO_4^ - + \dot Q - OH(k \cong 3.5 \cdot 10^8 M^{ - 1} \cdot s^{ - 1} ), SO_2^{\mathop \cdot \limits^ - } + Cl^ - \to SO_4^{ - 2} + Cl(k \cong 3.1 \cdot 10^8 M^{ - 1} \cdot s$ .

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