The quenching of rhodamine 101 emission in methanol by triethylamine, N,N-dimethylaniline, diphenylamine and N-methyldiphenylamine was attributed to electron transfer.The values of the rate constants, which range from 10 8 -10 10 M-l s-l , are in agreement with theoretical predictions of electron transfer.A comparison is made between the redox processes in methanol and on the surface of hydrocarbon latex particles suspended in 1 aqueous solution.The association constants for the equilibria of rhodamine 101 and diphenylamine between the latex and bulk solution are 3.0 x 10 4 and 1.6 x 10 4 M-l , respectively.The quenching efficiency of diphenylamine containing 17 to 98 ppm latex in solutions /-is 22-72 folds higher than that in the methanolic solution.The fluorescence lifetime of rhodamine 101 is 4 ns in methanol.The fluorescence quantum yield in methanol (¢F = 0.99) and water (¢F = 0.71) were also determined.The implication of these results to photochemical storage reactions is discussed.
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Frank et al. (1979) studied this question.