Binding Modes of a Phenylpyridinium Styryl Fluorescent Dye with Cucurbiturils.

The rate coefficients of the radiative and non-radiative deactivations, k r and k nr , can be obtained from the fluorescence lifetime and fluorescence quantum yield, using the set of Equations (4) and (5): (4) 1 τ F = k F = k r + k n r (5) Φ F = k r k r + k n r As shown in Table 2 , the values of k r fall all in the range of 1.5–2.0 × 10 8 s −1 and do not show a clear trend with the viscosity.

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