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• W2088746814 endingPage "90" @default.
• W2088746814 startingPage "82" @default.
• W2088746814 abstract "The interaction of 1,4-dihydroxy-9,10-anthraquinone, (quinizarin; QZ), with α-, β- and γ-cyclodextrin (CD) hosts, has been investigated using absorption, and steady-state and time-resolved fluorescence measurements, in order to understand the effects of cavity size of CDs on the binding of QZ molecule and the changes in the photophysical properties of QZ in the microenvironment of the hosts. The results demonstrate that QZ forms inclusion complexes with all the CDs. The low binding constants as well as the thermodynamic parameters indicate that the mode of interaction between QZ and CDs is mainly hydrophobic in nature. The relative magnitudes of the binding constants and the differential enhancements in the fluorescence intensity of QZ upon complexation with the CDs can be explained by considering the relative dimensions of the host cavity and the guest molecule, as well as the orientation of the guest molecule inside the CD cavity. It is proposed that the unsubstituted benzene ring of QZ is encapsulated within α- and β-CD cavities whereas the dihydroxy-substituted aromatic ring is encapsulated within the γ-CD cavity. This is further supported by the complexation studies of the QZ·CD systems with Al(III) ions. It is observed that the complexation of QZ with the metal ion is enhanced in the QZ·α-CD and QZ·β-CD systems whereas it is significantly reduced in the QZ·γ-CD system, due to shielding of the chelating groups of the dye inside the CD cavity in the latter case." @default.
• W2088746814 created "2016-06-24" @default.
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• W2088746814 creator A5062762737 @default.
• W2088746814 creator A5086982007 @default.
• W2088746814 creator A5088432838 @default.
• W2088746814 date "2009-01-01" @default.
• W2088746814 modified "2023-09-27" @default.
• W2088746814 title "Host-guest interaction of 1,4-dihydroxy-9,10-anthraquinone (quinizarin) with cyclodextrins" @default.
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• W2088746814 doi "https://doi.org/10.1039/b815294b" @default.
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