Preparation and Characterization of Mg-Al/Zn-Al Layered Double Hydroxides Intercalated with Calcein

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The intercalation of calcein into Mg/Al-NO3-LDHs and Zn/Al-NO3-LDHs by co-precipitaiton and ion-exchange method has been investigated. The obtained intercalation compounds were characterized by XRD, FT-IR and TG-DSC techniques. The results show that the original interlayer nitrate ions can be replaced by the organic anions under the controlled conditions. From the XRD data, the guest size and the orientation of anions between the layers were determined and after intercalation the interlayer spaces of the materials are expanded to 1.81 nm. FT-IR and DSC/TG curves reveal the presence of a complex system of supramolecular host-guest interaction and the increase of thermal stability of materials and the photochemical properties of compounds were studied by UV-Vis adsorption spectroscopy. These results indicate that the confinement of the UV absorbents in their anionic form within the restricted space of the interlayer region of LDHs is in favor of guest-host and guest-guest interactions, so that the UV aborption range and ability of the intercalation compounds are changed.

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April 2016

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