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Comparative study of the optical behavior of a porphyrin encapsulated in sol gel silica coatings and in solution as a function of pH

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Academic year: 2020

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Fig. 1. Molecular structure of the porphyrin used as a dopant of the sol-gel thin coatings.
Fig. 3. Molar absorptivity of the porphyrin in methanol solution.
Fig. 6. Excitation spectra of the porphyrin in methanol solution for different pH values.
Table 3 summarizes the most important features of the ab- ab-sorption spectra of doped coatings; pH at which maximum  wave-lengths occur and asymmetry factors are also shown.
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