Knoer, Guenther (2000) Reductive fluorescence quenching of the photoexcited dihydroxy antimony(V) tetraphenylporphine cation in acetonitrile solution. CHEMICAL PHYSICS LETTERS, 330 (3-4). pp. 383-388. ISSN 0009-2614
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At 298 K in acetonitrile solution, the dihydroxy antimony(V) tetraphenylporphine cation [Sb-V(TPP)(OH)(2)](+) shows an intraligand fluorescence at lambda (max) = 598 nm with tau (F) = 1.46 ns and a quantum yield of phi (F) = 0.028. While the presence of dioxygen has no significant effect on the value of phi (F), the fluorescence is very efficiently quenched by Cl-, Br- I- and SCN- ions. At quencher concentrations below 10(-2) M the reaction follows Stern-Volmer kinetics with high rate constants close to the diffusion-controlled Emit. Based on the observation of the reduced complex [Sb-III(TPP)](+) as a permanent photoredox product, the quenching mechanism can be characterized as a bimolecular electron transfer process involving the lowest excited singlet (pi pi*) state of the [Sb-V(TPP)(OH)(2)](+) cation. (C) 2000 Elsevier Science B.V. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | TETRAPHENYLPORPHYRINATOANTIMONY(V); PHOTOSENSITIZER; PHOTOCHEMISTRY; CYCLOHEXENE; PORPHYRINS; COMPLEXES; ELECTRON; BROMINE; OXYGEN; IONS; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Anorganische Chemie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 15 Mar 2022 10:51 |
| Last Modified: | 15 Mar 2022 10:51 |
| URI: | https://pred.uni-regensburg.de/id/eprint/42062 |
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