INTRAMOLECULAR INTERACTIONS IN THE GROUND AND EXCITED-STATES OF 1,3-BICHROMOPHORIC PROPANES IN THE AQUEOUS CYCLODEXTRIN SOLUTIONS

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 gamma -cyclodextrin. Two bichromophoric propanes, 1,3-di-2-naphthylpropane and 1-(1-naphthyl)-3-(2-naphthyl) propane, in the aqueous beta - and gamma -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.