POSSIBLE RELATIONSHIP OF MECHANISMS OF MN2-IONS OXIDATION AND THE MANGANESE CLUSTER OF THE PHOTOSYSTEM-2 PLANT FORMATION()

The mechanisms of Mn2+ cation oxidation in alkaline, neutral, and weak ly acidic media were studied. In all the cases, the Mn2+ oxidation res ulted;in the formation of the structure Mn2+ [GRAPHICS] Mn4+ = O. The external similarity and difference in the Mn2O3 structure and Klein's model of the Mn cluster of PS 2 were noted. The necessity of the prima ry ligation of Mn2+ cations was discussed for both the decrease in the . Mn2+ oxidation potential and the stability of the Mn2O3,structure. I t was supposed that Mn2O3 is an initial block for assembly of the inor ganic core of the photosynthetic water-oxidizing complex.