A spectral shift of up to 70 nm is observed for the dye HPIP depending on the size of the cyclodextrin cavity in which it is encapsulated. The fluorescence results from a phototautomerization in which proton transfer and twisting of the molecule are influenced by its surroundings. A model of a 1:2 complex of HPIP with a cyclodextrin is depicted on the right.
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Douhal et al. (1997) studied this question.
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