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Proton-coupled electron transfer general schemes

Protons are in general indispensable for the dismutation of superoxide (Eq. (4)). Also in the case of its dismutation catalyzed by a metal center, two protons are needed for the dissociation of the product (H2O2) from the metal center (Scheme 9). Therefore, a complex which can accept two protons upon reduction and release them upon oxidation is an excellent candidate for SOD activity. The studies on proton-coupled electron transfer in Fe- and Mn-SODs 48), demonstrated that the active site of MnSOD consists of more than one proton acceptor (Scheme 10). Since the assignment of species involved in proton transfer is extremely difficult in the case of enzymatic systems, relevant investigations on adequate model complexes could be of vast importance. H2dapsox coordinates to Fe(II) in its neutral form, whereas in the case of Fe(III) it coordinates in the dapsox form. Thus, oxidation and reduction of its iron complex is a proton-coupled electron transfer process 46), which as an energetically favorable... [Pg.77]


See other pages where Proton-coupled electron transfer general schemes is mentioned: [Pg.78]    [Pg.503]    [Pg.825]    [Pg.244]    [Pg.164]    [Pg.153]    [Pg.489]    [Pg.441]    [Pg.477]    [Pg.539]    [Pg.136]    [Pg.104]    [Pg.133]    [Pg.13]    [Pg.508]    [Pg.157]    [Pg.16]    [Pg.201]    [Pg.6]   
See also in sourсe #XX -- [ Pg.146 , Pg.147 , Pg.148 , Pg.149 , Pg.150 ]




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2 -Electron-2 -proton transfer

Coupling scheme

Electron coupled

Electron coupled transfers

Electron coupling

Electron proton

Electron protonation

Electron transfer coupling

Electron transfer electronic coupling

Electron-proton coupling

Electronic coupling

General scheme

Generalized electronic

Proton coupled electron transfer

Proton coupling

Proton generalized scheme

Proton transfer coupled

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