Electron Injection Process of Porphyrin Dye into Heterogeneous TiO<SUB>2</SUB>/Re(I) Photocatalyst
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초록
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The net hetero-collisional electron transfer from the non-anchored fluorescent porphyrin sensitizer to the TiO2 catalytic particles was a major event during the initial stage of the catalysis. According to in situ UV‒Vis absorption spectroscopy and mass analysis of dye solution filtered after photolysis, the initially added porphyrin dye experienced a significant photodegradation accompanied by a breakage of π‒conjugation and loss of the bulky substituents. Acetyl- or ethyl-group modified porphyrins were prepared, respectively referred to as ZnPAcet and ZnPEt, and this modification elevated the corresponding excited-state energy levels when comparing ZnP with ZnPEt, consequently shortening the activity delay at the early stage of photolysis. Thus, chemical modification had a favorable effect on the photosensitizing and electron transportation abilities of the dye.