Abstract
Two types of porphyrins (water-soluble and water-insoluble) were encapsulated in transparent mono- lithic silica gels. Their properties in solutions and at vari- ous steps of the sol-gel process were studied by absorption and emission electron spectroscopy. A photocatalytic sys- tem containing porphyrins immobilized in powdered silica gel for a-pinene biomimetic oxidation to pinocarveol, pi- nocarvone and myrtenol is reported. The impact of several parameters (visible light irradiation time, organic solvent, the presence of an electron acceptor/donor, and substrate concentration) on this biotransformation process was investigated and optimized. It was established that photo- chemical excitation of sol-gel immobilized metal-free porphyrins is crucial for catalyzed oxidation of monoterpenes.
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