Abstract
In the present work, a new kind of fluorescein-based chemosensor L was designed and synthesized to selectively recognize Ca2+ or Mg2+ over other competing ions. The chemosensor showed “off–on” fluorescent and color changes upon the addition of Ca2+ and Mg2+. The dynamic binding events with the formation of 1:1(L/M) and 1:2(L/M) complexes were examined. The cation-driven conformation changes of L were understood and proposed rationally by the UV–vis, FL, and 1HNMR titrations. By this allosteric effect, Ca2+ and Mg2+ could be selectively recognized with the 1:2 stoichiometry by fluorescent changes, which were different from other known reports on chemosensors that the host-cation complexion was exploited for controlling chromophore interaction as the model of signaling.
Published Version
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