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Reactions of some Free Radicals Derived from Uracil with Nickel(II) Compounds

DOI: 10.1039/f19848001205

Source and publish data:

Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases p. 1205 - 1216 (1984)

Update date:2022-09-26

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Authors:

Bhattacharyya, Sudhindra N.Bhattacharyya, Sudhindra N.

Mandal, Parikshit C.Mandal, Parikshit C.

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Article abstract of DOI:10.1039/f19848001205

Reactions of Ni(II) compounds with the transient adducts of uracil, viz.U(1-) and UOH, have been studied in the steady-state radiolysis of uracil in the presence of different Ni(II) species, e.g.NiSO4, Ni(II)EDTA, Ni(II)NTA, Ni(II)IDA and Ni(II)(IDA)2.The U(1-) radicals formed by the reaction of uracil with e(1-)aq transfer an electron to the Ni(II) species.The redox behaviour of UOH radicals has been investigated by following the ligand-degradation products of the Ni(II) complexes and the degradation of the base.The ligand-degradation products, e.g. formaldehyde and glyoxalic acid, arise from the degradation of the metal complex through its oxidation to Ni(III) by C6-UOH radical species.Unlike Cu(II) or Fe(III) ions, Ni(II) ions have very little effect on the radiosensitivity of uracil.The radiosensitising ability of the metal ions, which is dependent on electron transfer from UOH to the metal ion, is correlated with the redox potential of the metal ion couple M(n+)/M((n-1)+).

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