Abstract: Two kinds of Tosylamine compounds(I, II) were synthesized and their fluorescence abilities were studied. Through the study of their recognition with Cu²⁺, Zn²⁺, Pb²⁺, Mg²⁺, Cd²⁺, Mn²⁺, Ca²⁺, Hg²⁺, Fe²⁺, Fe³⁺, Ni²⁺, Co²⁺ cations, it was found that both of the two kinds of compounds had recognition to Fe³⁺ in EtOH/H₂O system through a series of iron-reorganization study. The fluorescence was changed by the addition of Fe³⁺, in which the fluorescence intensity of compounds I, II at 338 nm or 339 nm decreased. Under the co-existence of NH₂OH·HCl and H₂O₂, both of the two compounds showed up that there could be a fluorescence switch by oxidation-reduction of Fe³⁺.

Key words: Tosylamine, Oxidation-reduction, Fluorescence switch