Abstract
The interaction of zinc(II) meso-tetraphenylporphyrin (ZnTPP) with colloidal TiO 2 was studied by absorption, steady state and time-resolved fluorescence spectroscopy. The quenching was found to obey the Stern–Volmer equation and the corresponding Stern–Volmer plots were linear in the range of quencher concentration used 0–5 × 10 −4 M. The bimolecular quenching rate constants ( k q) were 20.5 × 10 10 M −1 s −1 (steady-state) and 2.85 × 10 10 M −1 s −1 (time resolved). The quenching process is suggested to involve electron transfer from the ZnTPP to TiO 2 considering the experimental evidences obtained.
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