1969 Volume 42 Issue 4 Pages 919-922
Fluorescence lifetime of acridine has been measured in water-ethanol and water-glycerol mixtures of different composition at 25°C. Remarkable decrease in lifetime value was found as the amount of organic component increases. The lifetime of 10.3 ns was obtained for the aqueous solution. The lifetimes in glycerol and in ethanol were determined as 3.2 and 0.72 ns, respectively. The observed ratio of the lifetime in the mixture to the lifetime in water, τ⁄τ0, has the same functional dependence on solvent composition as the ratio of fluorescence yield, Φ⁄Φ0. These quenching phenomena by organic molecules have been interpreted as due to the solvent effects upon the radiationless transition rate. Both static and dynamic mechanisms of quenching are not applicable in the present cases of solvent quenching.
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