Abstract: Two sulfamide host compounds (I, Ⅱ) were synthesized and their fluorescence character was studied. Through the study of their recognition with Cl^-, Br^-, NO₃^-, NO₂^-, HSO₄^-, Ac^- and F^- anions in CH₃CN, it was found that both of the hosts have a selective recognition with F^-. An exciplex formed by the addition of F^-, in which the fluorescence intensity of compound I, Ⅱ at 317 nm decreases and a new broad emission band peaked at 403 nm emerges with increasing intensity.

Key words: fluorescence chemosensor, anions, fluorescence recognition