Journal of the Chemical Society - Faraday Transactions p. 3879 - 3882 (1990)
Update date:2022-08-11
Topics:
Lambert, C.
Sarna, T.
Truscott, T. G.
The one-electron oxidised (radical cation) and one-electron reduced (radical anion) forms of the photosensitiser rose bengal have absorption maxima at 470 nm (molar absorption coefficient 21100 dm3 mol-1cm-1) and 420 nm (molar absorption coefficient 37600 dm3mol-1cm1-), respectively.The radical anion (RB.-) undergoes electron-transfer reactions both with oxygen (k=1.5E8 dm3mol-1s-1) and iron(III) complexed with ethylenediamineteteraacetic acid (EDTA) (k=4.5E8 dm3mol1-s1-) and diethylenetriaminepentaacetic acid (DTPA) (k=8.6E8 dm3mol-1s-1).Rose bengal reacts both with solvated electron and semireduced nicotinamide adenine dinucleotide radical (NAD.) to give RB.- with the second-order rate constants of 3.1E10 and 9.6E8 dm3mol1-s1-.The one electron-reduction potential E21 for rose bengal, measured vis pluse radiolysis, was found to be -511 mV.
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