title: An investigation on electron transfer quenching of zinc(II) meso-tetraphenylporphyrin (ZnTPP) by colloidal TiO(2).
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 x 10(-4)M. The bimolecular quenching rate constants (k(q)) were 20.5 x 10(10)M(-1)s(-1) (steady-state) and 2.85 x 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.
authors.affiliation: School of Chemistry, Bharathidasan University, Tiruchirappalli 620024, Tamil Nadu, India.
authors.forename: A
authors.initials: A
authors.lastname: Kathiravan
authors.forename: R
authors.initials: R
authors.lastname: Renganathan
mesh_terms: D003102:Colloids; D004563:Electrochemistry; D004579:Electron Transport; D008665:Metalloporphyrins / Q000737:chemistry*; D008956:Models, Chemical; D010084:Oxidation-Reduction; D055668:Photochemical Processes; D017319:Photosensitizing Agents / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D013053:Spectrophotometry; D013816:Thermodynamics; D014025:Titanium / Q000737:chemistry*; D015032:Zinc / Q000737:chemistry*
chemical_list: D003102:Colloids; D008665:Metalloporphyrins; D017319:Photosensitizing Agents; C009495:titanium dioxide; C048955:zinc tetraphenylporphyrin; D014025:Titanium; D015032:Zinc