Figure 4.
![The substrate water molecules and products of the oxidation reactions for each S-state are shown in red. Intermediates that may exist between the S-state transitions are not depicted, nor is the possible peroxide intermediate just prior to O–O bond formation. Although the electrophilic oxo in the S4 state is shown attached to Mn(V) it could equally be a terminal Mn(IV)-oxyl radical species. Reproduced from [14] with permission.](https://port.silverchair-cdn.com/port/content_public/journal/biochemsoctrans/48/6/10.1042_bst20200758/1/bst-2020-0758.04.png?Expires=1716569848&Signature=WmxoaWCG9cr1EWwZ8cHwl0O9WnidkDvH8B2aFFsZUuppv97ib2xhOtcMOdlnMFwXlIfZrBljEU2AGjIHh5cyRFZZjHOQfYRP0MWyP9w~YZeCm2RQlhfJztABI0GPiCBRhRheD6QI6zfz4xlx3vWZMbLjgTeSp58EmN99e1hEKueBeEHKOOsix9O8fW4cGqd8VYEoRyySxnXpMvqU~YXBbriPYXS4ZJtYQUbP~OTPyxGSPOjyHuujSwKMSa0JzKsQejdSiTCjyVHCQk6nXMRmC1zZI3NP8hUV1Q6RrhmhF9l6p9rM9UVYkhx7m612TGDDjyLOod~avberAftrfacH9A__&Key-Pair-Id=APKAIE5G5CRDK6RD3PGA)
A diagrammatic representation of a mechanistic scheme for water splitting and dioxygen formation in PSII proposed by the author [14].
The substrate water molecules and products of the oxidation reactions for each S-state are shown in red. Intermediates that may exist between the S-state transitions are not depicted, nor is the possible peroxide intermediate just prior to O–O bond formation. Although the electrophilic oxo in the S4 state is shown attached to Mn(V) it could equally be a terminal Mn(IV)-oxyl radical species. Reproduced from [14] with permission.