Abstract
The xanthene dye fluorescein was immobilized, via anion-exchange reactions, in the interlayer region and/or on the surface of a synthetic Zn−Al hydrotalcite, prepared by the thermal hydrolysis of urea. Surface uptake was investigated by equilibrating [Zn0.67Al0.33(OH)2] [CO3]0.165 0.4 H2O with diluted solutions of fluorescein disodium salt. Only carbonates present on the surface of microcrystals were exchanged by fluoresceinate anions to reach a maximum uptake of 50 μmol/g. Intercalation compounds were obtained by equilibrating the perchlorate form of hydrotalcite [Zn0.67Al0.33(OH)2] [ClO4]0.33 0.6 H2O (interlayer distance 11.0 A) with 10-2 mol/dm3 fluorescein disodium salt solution. Intercalation of fluoresceinate anions occurs with a first-order phase transition from the ClO4- phase to a phase containing 0.11 mol of fluoresceinate per mol of the host and an interlayer distance of 16.5 A. The materials were characterized by chemical and thermal analysis and by X-ray powder diffraction and FT-IR technique...
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