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The fluorescence quenching of excited singlet state of 2,4,6-triphenylpyrylium tetrafluoroborate (TPPBF 4  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 × 10 10  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.

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