1,8-萘酐类铅离子荧光探针的合成及荧光性质研究

Study on the Synthesis and Fluorescence Properties of 1,8-Naphthalimide-based Pb^(2+) Fluorescence Probes

以1,8-萘酐和萘乙二胺为原料设计合成了一种新的铅离子荧光探针M1,并对其结构进行了表征.荧光光谱实验表明:在乙醇溶液中,M1对Pb2+表现出了识别性能,随Pb2+的加入,其荧光光谱强度发生明显猝灭,而对Na+、K+、Ag+、Hg2+、Cr3+等离子无明显响应.Job’s plot实验显示M1与金属离子形成结合比为1∶1的配合物,Pb2+在0～9×10-5 mol·L-1范围内,探针的荧光强度与其浓度成线性关系.

A simple and effective Pb2＋ fluorescent sensor M1 based on 1, 8-naphthalimide and N （1-naphthyl） ethylenediamine has been synthesized with the structure characterized. Nat , K＋ , Ag＋ , Hg2＋ , Cr3＋ and Pb2＋ ions were used to investigate the metal ion binding properties of M1 of emission changes. The result shows that this probe displayed a highly selective fluorescent quenching with Pb2＋ , but other ions not. The method of Job＇ s plot indicated a 1 ： 1 stoichiometry of the M1 to Pb2＋ in the complex. The decrease in fluorescence intensity occurs after the addition of Pb2＋ cations in the concentration ranging from 0 to 9 ×10 5 mol. L-1 and shows a good linear relationship.