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| - Aromatic Molecules in Restricted Geometries: Photophysics of Naphthalene Included in aCyclodextrin Functionalized Layered Solid
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| - The galleries of an Mg−Al layered double hydroxide have been functionalized by intercalation ofcarboxymethyl β-cyclodextrin cavities. The anchored cavities form a random array of identical-sizedhydrophobic nanopockets arranged in a bilayer fashion in the interlamellar space of the layered solid.Naphthalene molecules have been included within these cavities by partitioning from a polar solvent. Thefluorescence from the included naphthalene shows an unusual behaviorthe excimer to monomer emissionintensity decreases with increasing concentration of included naphthalene. This is shown to be a consequenceof the absence of translational mobility of the naphthalene−cyclodextrin adduct in the functionalized solid.Two types of included naphthalene have been identified: a preformed excimer-like species characterized bythe absence of rise time in decay measurements and a monomeric species that is incapable of excimer formationdue to the absence of suitably located included naphthalenes in its proximity. The concentration of eachspecies and the enthalpy for excimer formation have been determined from the temperature variation offluorescence intensities.
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