Al^(3+)荧光探针的合成及识别性能研究

Synthesis and Recognition Properties of a Fluorescence Sensor for Al^(3+) Based on Naphthalene

以2-羟基-1-萘甲醛和邻苯二胺为原料,通过席夫碱反应合成了一个Al^(3+)荧光探针。采用紫外-可见和荧光光谱法研究了探针在乙腈溶液中对金属离子的识别能力。实验结果表明,该探针在乙腈及其水溶液中可以有效、快速地检测Al^(3+)。通过荧光滴定曲线、Job's曲线和Benesi-Hildebrand曲线,得出探针分子与Al^(3+)的配合比和配合常数分别为2∶1和2.65×10~5,并测得Al^(3+)的最低检出限为1.85×10^(-8)mol/L。

A fluorescent probe for Al3＋ was syntheszied by the Schiffobase reaction of 2-hydroxy-l-naphthaldehyde and o-phenyl- ene. The recognition properties of the probe for metal ions have been investigated by the UV-Vis and fluorescence spectrophotome- try in aeetonitrile solution. The results showed that the probe could effectively and quickly detect Al3＋ in acetonitrile and its aque- ous solution. The complexation ratio and the binding constant of the probe L with Al3＋ by the fluorescence titration curve,Job＇s plot and Benesi-Hildebrand plot were 2：1 and 2. 65 × 10^5 ,respectively. The detection limit for Al3＋ was 1.85 × 10^-5 mol/L.