P. Neta

Chemical behavior of sulfur trioxide(1-) (SO3-) and sulfur pentoxide(1-) (SO5-) radicals in aqueous solutions

The chemistry of the radicals SO/sub 3//sup -/ and SO/sub 5//sup -/ has been investigated by using pulse radiolysis with kinetic spectrophotometry. Rate constants for the oxidation by SO/sub 3//sup -/ of a variety of organic compounds were measured and equilibrium constants determined for the reactions of SO/sub 3//sup -/ with chlorpromazine and phenol. SO/sub 3//sup -/ was found to be a mild oxidant with a redox potential of E(SO/sub 3//sup -//SO/sub 3//sup 2 -/) = 0.63 V (vs. NHE) at pH > 7 and E(SO/sub 3//sup -//HSO/sub 3//sup -/) = 0.84 V at pH 3.6. The reaction of SO/sub 3//sup -/ with O/sub 2/ was shown to produce SO/sub 5//sup -/. The oxidation of several compounds by SO/sub 5//sup -/ was found to occur more rapidly than their oxidation by SO/sub 3//sup -/. E(SO/sub 5//sup -//HSO/sub 5//sup -/) was estimated to be approximately 1.1 V at pH 7. 44 references, 2 figures, 2 tables.

Reaction of the vanadate ion with chlorpromazine and the chlorpromazine free radical with the vanadyl ion

Cinetique de la reaction de V(V) avec la chlorpromazine. Formation du radical libre de la chlorpromazine, par radiolyse pulsee de la chlorpromazine