Manganese gluconate complexes

The reactions of the several manganese gluconate complexes with molecular oxygen and hydrogen peroxide have been studied in terms of stoichiometry and reaction kinetics. Reaction mechanisms are proposed on the basis of the kinetic data. In addition, the thermodynamic and mechanistic characteristics of an ideal model system for photosystem-II are analyzed and evaluated. 

Figure 2. Absorption spectra for 5mF manganese gluconate complexes in...

The oxidation-reduction chemistry of the manganese-gluconate complexes can be expressed by Reactions 6-8. 

Table I. Magnetic Moments of Manganese Gluconate Complexes from the NMR Method of Evans (56)...

On the basis of these prior electrochemical (62, 63) and kinetic (64) studies and the present results, the reaction stoichiometries for the manganese gluconate complexes with molecular oxygen and hydrogen peroxide can be expressed by a series of reactions. The primary reaction between the Mn(II) complex and molecular oxygen is rapid (Reaction... 

Manganese(VI) complexes,4,109-111 Manganese(VII) complexes, 4,109-111 Manganese dioxide oxidation, 6, 356 Manganese gluconate... 

The present paper summarizes the oxidation-reduction chemistry of the gluconate complexes of Mn(II), Mn(III), and Mn(IV) in alkaline media. Electrochemical, spectrophotometric, and magnetic susceptibility measurements have been used to establish the formulas and chemical characteristics of the complexes. The oxidation-reduction chemistry for the manganese complexes formed by other ligands with polyhydroxyl functions also has been determined. 

The manganese (III) gluconate complexes are oxidized slowly to the Mn(IV) complex by molecular oxygen, which is reduced to peroxide ion (Reaction 16). A separate set of experiments has established that... 

---