Fs-time-resolved diffuse reflectance and resonance Raman spectroscopic studies on MCM-41 as microchemical reactor

We have encapsulated porphyrin derivatives into MCM-41, TiMCM-41, and Cu-square-AlMCM-41, and its photoinduced electron transfer were investigated by steady state and ultrafast time-resolved spectroscopy. All spectroscopic results measured for tetraphenyl Porphine Manganese (III) Chloride (Mn(III)TPPCl) encapsulated in MCM-41 and TiMCM-41 reveal that framework modification by incorporating the TiO2 into the MCM-41 enhances the electron accepting ability of the MCM-41 framework. And also, Raman and UV-Vis spectroscopic investigations for Zn-II tetraphenylporphyrin ((ZnTPP)-T-II) encapsulated into MCM-41 and (CuAlMCM)-Al-II-41 allow us to conclude that (ZnTPP)-T-II in MCM-41 is oxidized to a considerable extent. Furthermore, central metal ion exchange of (ZnTPP)-T-II encapsulated into (CuAlMCM)-Al-II-41 gives Cu-II tetraphenylporphyrin ((CuTPP)-T-II) with almost unit transformation efficiency. In conclusion, metal ion exchanged MCM-41, (CuAlMCM)-Al-square-41, might be used for microchemical reactor metal-ion exchange reactions of the porphyrin derivatives.