Relevance of the reaction of a manganese(III) chelate with hydroxide ion to photosynthesis: Reaction of hydroxide ion with 5,10,15,20-tetrakis(2,4,6-trimethylphenyl)porphinatomanganese(III) in ligating and nonligating solvents

AUTOR(ES)

Nakagaki, Paul C.

RESUMO

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.

Documentos Relacionados

• Photoinduced oxidation of a water-soluble manganese(III) porphyrin
• Observations and comments on the mechanism of epoxidation of alkenes by manganese(III) porphyrins with hypochlorite.
• Autoagregação da 5,10,15,20-tetrakis(4-metoxifenil)porfirina (tmpp): estudos espectroscópicos e análises multivariadas
• Photodynamic activity of chloro(5,10,15,20-tetraphenylporphyrinato)indium(III)
• Modified silicas covalently bounded to 5,10,15,20-tetrakis(2-hydroxy-5-nitrophenyl)porphyrinato iron(III): synthesis, spectroscopic and EPR characterization. Catalytic studies