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Three representative model structures for the final step in the Kok cycle with O5 and O6 bound (see Figs. 8, 10); A Mn(IV)-oxyl formation at Mn1, octahedral coordination, all Mn(IV), open cubane structure; B Mn(IV)-oxyl formation at Mn4, octahedral, closed cubane structure; C Mn(V) = O formation at Mn4, trigonal bipyramidal, closed cubane. The putative reacting oxygens are indicated by dotted red circles; for details see text.
Figure adopted from (Pantazis 2018)
