A reversible and highly selective fluorescent probe for monitoring Hg2+ and iodide in aqueous solution
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文摘
To realize highly selective relay recognition of Hg2+ and I鈭?/sup> ions, a simple 1, 4-bis (2-benzimidazolyl) benzene (L) was designed and synthesized. Sensor L displays rapid, highly selective and sensitive recognition to Hg2+ in H2O/C2H5OH (9:1, v/v) solution. Furthermore, in the situ generated L-Hg2+ ensemble could recover the quenched fluorescence upon the addition of iodide anion resulting in an OFF-ON-OFF type sensing with a detection limit of 1.0 脳 10鈭? mol/L in the same medium. Notably, the sensor was retrievable to indicate iodide anions with Hg2+, and I鈭?/sup>, in turn, increased. This successive recognition feature of sensor L makes it has a potential utility for Hg2+ and I鈭?/sup> anion detection in aqueous solution.
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