A Simple Benzimidazole Based Fluorescent Sensor for Ratiometric Recognition of Zn<sup>2+</sup>in Water
作者:Keli Zhong、Mingjun Cai、Shuhua Hou、Yanjiang Bian、Lijun Tang
DOI:10.5012/bkcs.2014.35.2.489
日期:2014.2.20
A phenylbenzimidazole derivatized sensor (L) that behaves as a ratiometric fluorescent receptor for $Zn^2+}$ in water has been described. In HEPES buffer at pH 7.4, sensor L displays a weak fluorescence emission band at 367 nm. Upon addition of $Zn^2+}$, the emission intensity at 367 nm is decreased, concomitantly, a new emission band centered at 426 nm is developed, thus facilitates a ratiometric $Zn^2+}$ sensing behavior. Sensor L binds $Zn^2+}$ through a 1:1 binding stoichiometry with high selectivity over other metal cations. Sensor L displays a linear response to $Zn^2+}$ concentration from 0 to $6.0\times}10^-5}M$, sensor L also exhibits high sensitivity to $Zn^2+}$ with a detection limit of $3.31\times}10^-7}M$.
一种苯基苯并咪唑衍生传感器(L)可作为水中 $Zn^2+}$ 的比率荧光受体。在 pH 值为 7.4 的 HEPES 缓冲液中,传感器 L 在 367 纳米波长处显示出微弱的荧光发射带。加入 $Zn^2+}$ 后,367 nm 处的发射强度会降低,同时会出现一个以 426 nm 为中心的新发射带,从而促进了 $Zn^2+}$ 感应行为的比例测量。传感器 L 通过 1:1 的结合比例与 $Zn^2+}$ 结合,对其他金属阳离子具有高选择性。传感器 L 对 $Zn^2+}$ 浓度从 0 到 $6.0\times}10^-5}M$ 显示出线性响应,传感器 L 还对 $Zn^2+}$ 具有高灵敏度,检测限为 $3.31\times}10^-7}M$ 。