一种高灵敏度高选择性的荧光素基比色荧光锌传感器(英文)

A Highly Sensitive and Selective Colorimetric Fluorescent Zinc Sensor Based on Fluorescein

本文报道了一种基于荧光素的锌离子传感器FN1,其在甲醇溶液中显示了对锌离子极高的灵敏度和选择性。随着锌离子的滴加,紫外-可见光谱中最初在371nm处的吸收峰消失,在437nm处出现了一个新峰。当在混合金属离子的甲醇溶液中滴加了相对于二价金属离子的等物质的量浓度的锌离子或相对于一价金属离子0.5倍物质的量浓度的锌离子后,锌离子积分荧光强度增强了近37倍(Φ=0.48,λmax(em)=513nm),估算的锌离子检测限为7μg·L-1。基于紫外-可见光、荧光和质谱的结果,讨论了1∶1的FN1/Zn2+配合物的结合机理。

A fluorescein based fluorescent sensor selectivity for Zn^2＋ over other metal ions in methanol. FN1 for Zn^2＋ was synthesized with excellent sensitivity and Upon the addition of Zn^2＋, the initial absorption band at 371 nm decreases and a new band at 437 nm appeares in UV-Vis spectrum. The integrated fluorescence enhancement is increased by almost 37 folds after the addition of equal moles of Zn^2＋ relative to other bi-valenced metal ions or 0.5 folds moles of Zn^2＋ relative to single-valenced ions in mixed ions solution of methanol（Φ=0.48, λmax（em）=513 nm）, And the detection limit of Zn^2＋ is estimated to be 7 μg·L^-1. The bonding mechanism of a 1：1 FN1/Zn^2＋ complex is discussed on the basis of UV-Vis, fluorescence, mass spectroscopic results and reference compound.