1993 Volume 1993 Issue 10 Pages 1141-1147
Molecular states of pyrene have been investigated in the ground mixtures with α-, β-, γ-cyclodextrins (CDs) and microcrystalline cellulose. In the ground mixture of pyrene with β-CD (Pyrene/β-CD=1.0), the fluorescence peak due to pyrene monomer appeared at 397 nm, which was not observed - in pyrene crystals. The fluorescence peak intensity due to pyrene monomer decreased with an increase of pyrene content in the ground mixture. Since timeresolved fluorescence analysis indicated the existence of inclusion compound in the ground mixture, it was suggested that pyrene molecules were monomolecularly included in β-CD cavities in the ground mixture. On the other hand, in the ground mixture with γ-CD (Pyrene/γ-CD=1.0), a fluorescence peak due to pyrene excimer was observed. The iden tical spectrum was observed in the inclusion compound with γ-CD. These results were interpreted in terms of the inclusion of two pyrene molecules in the γ-CD cavity. In the ground mixture with α-CD having small cavity, and in that with microcrystalline cellulose having no cavity, similar small spectral changes of pyrene were observed.
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