Add time:08/28/2019         Source:sciencedirect.com

Complex formation between cyclodextrins and 1,8-dihy-droxyanthraquinone in buffer solution has been investigated using absorption, its second derivative (D2), and fluorescence spectroscopy. The results showed that whereas the self-association process was found for 1,8-Dihydroxyanthraquinone (cas 117-10-2) alone, the monomeric form is microincluded in β- and γ-cyclodextrins. The interaction is more favored as the cavity size of cyclodextrins is larger, the molecule being more tightly bound with γ- than with β-cyclodextrin. The complex formation inhibits the excited-state intramolecular proton transfer process that has already been reported for 1,8-dihydroxyanthraquinone alone.

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