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Inclusion complex formation of 1,8-dihydroxyanthraquinone with cyclodextrins in aqueous solution and in solid state

✍ Scribed by Giulietta Smulevich; Alessandro Feis; Giovanni Mazzi; Franco F. Vincieri

Publisher: John Wiley and Sons
Year: 1988
Tongue: English
Weight: 451 KB
Volume: 77
Category: Article
ISSN: 0022-3549
DOI: 10.1002/jps.2600770612

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✦ Synopsis

Complex formation between cyclodextrins and 1 ,d-dihydroxyanthraquinone in buffer solution has been investigated using absorption, its second derivative (D'), and fluorescence spectroscopy. The results showed that whereas the self-association process was found for 1,8-dihydroxyanthraquinone alone, the monomeric form is microincluded in pand 7-cyclodextrins. The interaction is more favored as the cavity size of cyclodextrins is larger, the molecule being more tightly bound with 7-than with p-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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