Abstract
An equimolar mixture of naphthalene and amorphous heptakis-(2,6-di-O-methyl)-β-cyclodextrin (DMβCD) was heated at 70 or 90°C in a sealed container. After heating ffor 15 min at 90°C, the mixture was crystallized to show an excimer fluorescence of naphthalene, and the fluorescence spectrum changed to a monomer emission by further prolongation of heating time, accompanied by a slight change in its powder X-ray diffractogram. It is suggested that a metastable complex showing the excimer emission of naphthalene was transformed to a stable complex showing the monomer emission. The mixing molar ratio of naphthalene to DMβCD was also found to affect the transformation temperature of the complex.
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Kawashima, H., Yonemochi, E., Oguchi, T. et al. Factors affecting the formation in the solid state of the metastable complex between naphthalene and dimethyl-β-cyclodextrin. J Incl Phenom Macrocycl Chem 23, 65–72 (1995). https://doi.org/10.1007/BF00706950
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DOI: https://doi.org/10.1007/BF00706950