Photochemical reduction of oxygen adsorbed to nanocrystalline TiO2 films: A transient absorption and oxygen scavenging study of different TiO2 preparations

Article Abstract:

An analysis is performed to study the interfacial electron-transfer reaction between the photogenerated electrons in nanocrystalline titanium dioxide (TiO2) films, made from three varying starting material in the presence of ethanol as hole scavenger, and molecular oxygen by applying transient absorption spectroscopy (TAS). It was inferred that the rate of reduction of molecular oxygen is restricted by interfacial electron-transfer kinetics instead by the electron trapping/detrapping dynamics within the for TiO2 particles.

Electric properties, Titanium compounds, Absorption spectra

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Intramolecular electron transfer from axial ligand to [S.sub.2]-excited Sb-tetraphenylporphyrin

Article Abstract:

The subpicosecond spectroscopic methods were used to investigate the [S.sub.2] state properties of Sb-tetraphenylporphyrin (SbTPP) derivatives. The findings revealed that the [S.sub.2] fluorescence lifetime changed depending on the donor-ability of the ligand due to the contribution of the charge separation to the [S.sub.2] excited SbTPP, which was confirmed by transient absorption spectroscopy.

Industrial Organic Chemicals, Cyclic Crude and Intermediate Manufacturing, Porphyrins, Analysis, Fluorescence spectroscopy, Properties, Structure

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