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Abstract
β-Arylpropiophenones do not phosphoresce in homogeneous solution as a result of excited state quenching by the β-aryl group. In the presence of cyclodextrins the parent substrate, β-phenylpropiophenone, shows readily detectable phosphorescence. The complexes show strong phosphorescence after lyophilization to dryness. The phosphorescence intensity of ring-substituted derivatives is strongly dependent upon molecular size and cavity dimensions, suggesting that the β-arylpropiophenones can be used to probe these properties.
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