Journal of Physical Chemistry p. 7166 - 7170 (1989)
Update date:2022-08-28
Topics:
Duveneck, Gert L.
Sitzmann, E. V.
Eisenthal, Kenneth B.
Turro, Nicholas J.
The effect on picosecond reaction dynamics due to complexation of a reactive molecule with cyclodextrins was examined, with the trans-cis photoisomerization of stilbene as an example.In the presence of α-cyclodextrin, a single, slow exponential decay of trans-stilbene fluorescence is observed, consistent with the formation of a single complex.In contrast, in the presence of β-cyclodextrin, the fluorescence of trans-stilbene showed a clear double-exponential decay, consistent with the formation of two complexes.In the latter case, a dynamic equilibrium between a loose and a more tightly bound conformation of the complex is proposed, resulting in different photoisomerization reaction rates of trans-stilbene.
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