Abstract
The inclusion behavior of cucurbit [7] uril with acridine orange was investigated by fluorescence spectrometry in acetate buffer solution. It was found that the fluorescence intensity of acridine orange regularly increased upon the addition of cucurbit [7] uril accompanying with blue-shift of the position of the emission maximum. The results indicate the formation of the complex at a 1:1 complex stoichiometry and the association constant was calculated by applying a deduced equation. From the temperature dependence of the equilibrium constants, ΔH and ΔS values were obtained, indicating an enthalpic driving force for complexation. Meanwhile, the possible interaction mechanism was also discussed.
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