Abstract
α-, β-, and γ-cyclodextrin derivatives bearing a p-(dimethylamino)benzoyl (DMAB) moiety (DMAB-αCyD, DMAB-βCyD, and DMAB-γCyD, respectively) have been synthesized as fluorescent sensors of molecular recognition. These compounds show dual fluorescence emission arising from normal planar (NP) and twisted intramolecular charge transfer (TICT) exited states, and among them strong TICT emission was observed for DMAB-βCyD. The induced circular dichroism spectra of the derivatives suggest that only DMAB-βCyD among other derivatives binds the DMAB moiety into its own cavity, forming an intramolecular inclusion complex. This conformation was confirmed by the analysis of its 1 H-NMR data and was related to its strong TICT emission
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