One-electron Reduction of 8-hydroxy-5-deazaisoalloxazine in Aqueous Solution: A Pulse Radiolysis Study |
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| Authors: | PF Heelis BJ Parsons AJ Swallow |
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| Institution: | 1. The North East Wales Institute, Deeside, Clwyd, CH5 4BR, UK;2. The Paterson Institute for Cancer Research, Christie Hospital and Holt Radium Institute, Manchester, M20 9BX, UK |
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| Abstract: | SummaryThe one-electron reduction of 8-hydroxy-5-deazaisoalloxazine (HMDI) has been studied in aqueous solution in the acidity range pH0 to 13 using the reducing species CO2·?, e?aq and (CH3)2COH radicals. The spectral and other properties of the HMDI radicals were found to be independent of the reductant used. Four protolytic forms of the radical were distinguished with associated pKa values of 2·3 ± 0·3, 6·0 ± 0·3 and 10·1 ± 0·3. |
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