Abstract
Abstract Fluorescence properties of excited 4 ′ -dimethylaminoacetophenone (DMAAP) complexed with α-, β-, and γ-cyclodextrins (CDs) were studied by means of steady state and time-resolved laser spectroscopy. The 1:2 DMAAP–α-CD and 1:1 DMAAP–β-CD complexes exhibited dual fluorescence in neutral aqueous solutions while only the fluorescence from the locally excited state was observed in the case of DMAAP complexed with γ-CD. The CD cavity size effect on the excited state dynamics of DMAAP–CD complexes was further discussed. It revealed that polarity effect introduced by the hydrophobic cavity is more important in controlling of the photochemistry of DMAAP than the restriction of molecular motion inside the CD cavity.
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