Fluorescence quenching process of anthracene by maleic anhydride.

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The time dependence of fluorescence intensity after picosecond laser excitation and the steady-state fluorescence intensity were measured in order to study the mechanism of fluorescence quenching of anthracene by maleic anhydride in 1,4-dioxane. The nonlinear relationship between the reciprocal of steady-state fluorescence intensity and quencher concentration was observed for this system and interpreted in terms of the transient effect in the quenching process. The kinetic study by picosecond laser photolysis supports this interpretation. The reaction radius (R) and the sum of diffusion constants of both reactants (D) at various temperatures were determined by applying the diffusion model of Andre et al. The observed values are R=7.2 Å, D=1.46×10−5 cm2 s−1 (22 °C), 1.87×10−5 cm2 s−1 (50 °C), 2.42×10−5 cm2 s−1 (75°C). Studies of the main path in the quenching process by nanosecond laser photolysis suggest the existence of an extra path in the quenching process which overwhelms the fluorescent exciplex formation, the photoionization, the triplet anthracene formation, and the adduct formation.
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