Abstract
The reaction of HO- with 5,10,15,20-tetrakis(2,4,6-trimethylphenyl)porphinatomanganese(III) chloride [(TMP)MnIII(Cl)] in ligating solvents (CH3CN, dimethyl sulfoxide, pyridine) results in formation of (TMP)MnII (≈106 M-1·s-r), which in a slower reaction is converted to a product whose structure is suggested to be that of a porphyrin manganese(III) peroxo dimer. Admittance of O2 at any time during these reactions leads to formation of the manganese(III) peroxide (TMP)MnIII(O2)-. In nonligating solvents [CH2Cl2, (CH3)2CO], the reaction of HO- with (TMP)MnIII(Cl) yields (TMP)MnIV(OH)2.
Keywords: photosystem II S4 state, water oxidation
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Selected References
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