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The Oxovanadyl(IV) catalysed Oxidation of Adrenaline by Molecular Oxygen

DOI: 10.1039/DT9860001833

Source and publish data:

Journal of the Chemical Society, Dalton Transactions p. 1833 - 1838 (1986)

Update date:2022-08-17

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Authors:

Jameson, Reginald F.Jameson, Reginald F.

Kiss, TamasKiss, Tamas

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Article abstract of DOI:10.1039/DT9860001833

The oxidation of adrenaline (H2LH+) by molecular oxygen in the presence of catalytic amounts of VO2+ ions has been followed using a Clark-type oxygen electrode.The empirical rate law -d/dt = kobs. + p was obtained in which p is a small constant (only observable at low pH) and kobs. is given by the relationship (i), where T and T are total initial concentrations of (i) VO2+ and adrenaline respectively.It is demonstrated that this behaviour is consistent with the involvement of both VO2+ and V2+ species and furthermore that it also calls for the presence of a tris(adrenaline) species, V(LH)3+.A kinetically determined equilibrium constant for reaction (ii) is VO(LH)2 + H2LH+ <*> V(LH)3+ + H2O (ii) reported.The necessary proton- and metal-ligand equilibrium constants were obtained by pH- and 1H n.m.r.-titration techniques.All solutions were made up to a constant ionic strength (I = 0.100 mol dm-3) with KNO3 at 25.00 +/- 0.02 deg C.

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