Polyethylene glycol (PEG)-linked manganese halogenated
porphyrins (Chart ) catalyzed oxidation of
azo dyes (Chart ) by H2O2 under mild
conditions such as pH 8.0 at 25 °C especially when imidazole
was
present, causing the decoloration of azo dyes. The decoloration of
azo dyes by synthetic manganese porphyrins
under mild conditions was first reported. The decoloration rate
depended on the structures of the porphyrins,
in which the largest rate was observed in the presence of PEG−MnDCPP.
The decoloration may be
contributed by radical species rather than electrophilic species,
consistent with the side-chain oxidation
of toluene. Kinetics on polyethylene glycol-linked manganese
porphyrin-catalyzed decoloration of C.I.
Acid Orange 7 by hydrogen peroxide revealed that the decoloration
was contributed at the oxidation
process by manganese porphyrins with hydrogen peroxide in the polymer
domain rather than the complex-formation process between manganese porphyrins and azo
dyes.
Water-soluble manganese porphyrins are catalysts for the decoloration of azo dyes by hydrogen peroxide under mild conditions (pH 8.0 and 25°C). The decoloration rate depends on the structure of the manganese porphyrin and the added ligands.
Manganese protoporphyrin or mesoporphyrin derivatives catalysed the decolorisation of azo dyes by hydrogen peroxide under mild conditions, pH 8.0 and 25°C. The decolorisation rate was increased by the presence of manganese protoporphyrin or mesoporphyrin derivatives and was dependent upon the structures of the porphyrins and of the azo dyes. The rate was found to depend upon the concentration of ligands. Kinetic studies of the decolorisation rate by hydrogen peroxide catalysed by a poly(ethylene glycol)‐linked manganese mesoporphyrin derivative showed how the structures of the porphyrin and the azo dye affect the rate.
Polyethylenimine (PEI)-appended porphyrin 2 bound DNA more strongly than non-polyethylenimine-appended porphyrins by creation of cationic charges of polyethylenimine and photochemically cleaved a double-stranded DNA.
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