Abstract
Manganese tetraphenylphorphyrin complex fixed on imidazole-modified silica exhibits fair catalytic activity for cyclohexane oxidation by hydrogen peroxide. Immobilization of the porphyrin complex could result in the prevention of the formation of μ-oxo dimers, increasing the catalytic capability. Turnover numbers for cyclohexane oxidation are greatly improved by decreasing metal loadings, suggesting the importance of site isolation of the metal complexes. Rather high loading of imidazolyl group is required since its ligation to Mn was fully effected when imidazolyl group in large excess of Mn is present, as shown in the change in the diffuse reflectance spectra with imidazolyl/Mn ratio.
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