Abstract
Abstract The enhanced fluorescence of several 1,3-bichromophoric propanes in aqueous cyclodextrin solutions has been investigated by the steady-state fluorescence spectra and fluorescence lifetimes. 1-(9,10-Dicyano-2-anthryl)-3-(1- and 2-naphthyl)propanes exhibit the intramolecular charge transfer complex fluorescence generated in the ground state in the presence of γ-cyclodextrin. Two bichromophoric propanes, 1,3-di-2-naphthylpropane and 1-(1-naphthyl)-3-(2-naphthyl)propane, in the aqueous β- and γ-cyclodextrin solutions show not only the intramolecular excimer but also the ground state complex fluorescences, though the ground state complex formation of dinaphthylpropane has never been observed in the homogeneous solution even at low temperature. The intramolecular interactions in the ground and excited states seem to be attributable to their intramolecularly geometrical restriction in the extraordinary nonpolar cavity of the cyclodextrins.
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