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V. Anbazhagan, A. Kathiravan, M. Asha Jhonsi, R. Renganathan

Fluorescence Quenching Study on Electron Transfer from Certain Amines to Excited State Triphenylpyrylium Ion (TPP⁺)

Keywords: 2,4,6-Triphenylpyrylium Tetrafluoroborate, Fluorescence Quenching, Photoinduced Electron Transfer, Amines

The fluorescence quenching of excited singlet state of 2,4,6-triphenylpyrylium tetrafluoroborate (TPPBF₄ or TPP⁺), a very good electron acceptor by amines were investigated in a acetonitrile solution using steady state technique. The bimolecular quenching rate constants lie in the range 2.11–10.26 × 10¹⁰ M^-1 s^-1. The driving force (ΔG_et) for electron transfer process was calculated from the oxidation potential of amines and the reduction potential of TPP⁺. The observed k_q values correlated well with the driving force for the electron transfer reactions. Aromatic amines show higher k_q than aliphatic amines. From the oxidation potential of amines and the quenching rate constant values, a mechanism involving photoinduced electron transfer from amines to excited state TPP is suggested.

Zeitschrift für Physikalische Chemie, Oldenbourg Wissenschaftsverlag

Print ISSN: 0942-9352
Volume: 221, 07/2007
Pages: 929 - 939

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