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One Electron Oxidation of 1,2-Dihydroxy-9,10-Anthraquinone and Its Transition Metal Complexes in Aqueous Solution: a Steady-State and Pulse Radiolysis Study

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Studies on the oxidation of 1,2-dihydroxy-9,10-anthraquinone (DHA) and its complexes with CuII, NiII and FeIII by'OH radicals and N3* radicals were carried out using steady-state γ-radiolysis and pulse-radiolysis studies. From the spectral properties of the product of oxidation it was observed that 'OH radical reacts with DHA and its metal complexes to form semioxidized quinone and OH-adduct while N3. predominantly produce semioxidized quinone. Steady-state radiolysis studies suggested that the metal co-ordinated OH-adduct of quinone gets oxidized to trihydroxy derivative of anthraquinone while the oxidized semiquinone undergo disproportionation. The rate constants for the oxidation of DHA by 'OH and N3* were also determined by pulse radiolysis.

Affiliations: 1: Nuclear Chemistry Division, Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Calcutta-700 064, India; 2: Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai-400 085, India


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