一种罗丹明衍生物的合成及其对三价金属离子(Fe~(3+)、Cr~(3+)和Al~(3+))的识别

三价金属离子(Cr~(3+)、Fe~(3+)和Al~(3+))与人体健康密切相关。目前,检测Cr~(3+)、Fe~(3+)和Al~(3+)需要采用不同的荧光探针,增加了检测成本和检测时间。发展能够同时检测Cr~(3+)、Fe~(3+)和Al~(3+)的高灵敏度和强抗干扰能力的荧光探针具有非常重要的意义。本文以罗丹明B为原料,合成和表征了一种罗丹明类荧光增强型探针(P),并研究了其光谱性质。研究表明,在V(甲醇)∶V(水)=9∶1体系中对三价金属离子Fe~(3+)、Cr~(3+)和Al~(3+)具有较高的选择性,不受其它二价金属离子及一价金属离子的影响,抗干扰能力强。同时,探针P对三价金属离子具有较高的灵敏度,对Cr~(3+)、Al~(3+)和Fe~(3+)的检测限分别为3.0×10~(-4)、2.7×10~(-4)和1.0×10~(-4)mol/L,表明其可用于Cr~(3+)、Al~(3+)和Fe~(3+)的检测。

Synthesis of a Novel Rhodamine-Based Probe and Its Selective Detection of Trivalent Metallic Ions

Trivalent metallic ions(Cr³⁺, Fe³⁺ and Al³⁺) play important roles in environment and human health. It is exhausting using different sensor in different conditions for detection of all the trivalent metallic ions. Single probes for detecting all of these trivalent metallic cations simultaneously with high sensitivity and selectivity have attracted great attention. A novel rhodamine-based probe P was synthesized from rhodamine B. It is showed that probe P acts as a “turn on” fluorescent probe for trivalent metallic ions(Fe³⁺, Cr³⁺ and Al³⁺) recognition. Probe P is highly selective to trivalent metallic ions over other monovalent or divalent metallic ions in V(CH₃OH)：V(Tris-HCl)=9：1. Furthermore, probe P is highly sensitive to trivalent metallic ions. The detection limits of probe P for Cr³⁺, Al³⁺ and Fe³⁺ are 3.0×10^-4, 2.7×10^-4 and 1.0×10^-4 mol/L, respectively. Probe P could be used in the detection of Cr³⁺, Al³⁺ and Fe³⁺.