An "off-on" fluorescent and colorimetric probe bearing fluorescein moiety for Mg2+ and Ca2+ via a controlled supramolecular approach

作者：Yu Xudong; Zhang Ping; Liu Qiaoran; Li Yajuan; Zhen Xiaoli; Zhang Yumei; Ma Zichuan^*

来源：Materials Science and Engineering: C , 2014, 39: 73-77.

DOI：10.1016/j.msec.2014.02.030

• Calcium
• Magnesium
• Fluorescence
• Chemosensor
• Supramolecular
• Naked-eye detection

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 (HNMR)-H-1 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.

• 出版日期2014-6-1
• 单位河北师范大学; 河北科技大学