title: An "off-on" fluorescent and colorimetric probe bearing fluorescein moiety for Mg(2+) and Ca(2+) via a controlled supramolecular approach.
abstract: In the present work, a new kind of fluorescein-based chemosensor L was designed and synthesized to selectively recognize Ca(2+) or Mg(2+) over other competing ions. The chemosensor showed "off-on" fluorescent and color changes upon the addition of Ca(2+) and Mg(2+). 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 (1)HNMR titrations. By this allosteric effect, Ca(2+) and Mg(2+) 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.
authors.affiliation: College of Science, Hebei University of Science and Technology, Yuhua Road 70, Shijiazhuang 050080, PR China; College of Chemistry and Material Sciences, Hebei Normal University, Yuhua Road 113, Shijiazhuang 050024, PR China. Electronic address: 081022009@fudan.edu.cn.
authors.forename: Xudong
authors.initials: X
authors.lastname: Yu
authors.affiliation: College of Chemistry and Material Sciences, Hebei Normal University, Yuhua Road 113, Shijiazhuang 050024, PR China.
authors.forename: Ping
authors.initials: P
authors.lastname: Zhang
authors.affiliation: College of Science, Hebei University of Science and Technology, Yuhua Road 70, Shijiazhuang 050080, PR China.
authors.forename: Qiaoran
authors.initials: Q
authors.lastname: Liu
authors.affiliation: College of Science, Hebei University of Science and Technology, Yuhua Road 70, Shijiazhuang 050080, PR China.
authors.forename: Yajuan
authors.initials: Y
authors.lastname: Li
authors.affiliation: College of Science, Hebei University of Science and Technology, Yuhua Road 70, Shijiazhuang 050080, PR China.
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Zhen
authors.affiliation: College of Science, Hebei University of Science and Technology, Yuhua Road 70, Shijiazhuang 050080, PR China.
authors.forename: Yumei
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: College of Chemistry and Material Sciences, Hebei Normal University, Yuhua Road 113, Shijiazhuang 050024, PR China. Electronic address: mazc@hebtu.edu.cn.
authors.forename: Zichuan
authors.initials: Z
authors.lastname: Ma
mesh_terms: D002118:Calcium / Q000032:analysis*; D002412:Cations / Q000737:chemistry; D003124:Colorimetry / Q000379:methods*; D019793:Fluorescein; D005456:Fluorescent Dyes; D007477:Ions / Q000737:chemistry; D057230:Limit of Detection; D008274:Magnesium / Q000032:analysis*; D009682:Magnetic Resonance Spectroscopy; D008968:Molecular Conformation; D013050:Spectrometry, Fluorescence
chemical_list: D002412:Cations; D005456:Fluorescent Dyes; D007477:Ions; D008274:Magnesium; D002118:Calcium; D019793:Fluorescein
keywords: Calcium; Chemosensor; Fluorescence; Magnesium; Naked-eye detection; Supramolecular