以间苯二甲酰肼和2-吡啶甲醛为原料合成了一种新型席夫碱荧光探针L,对其结构进行了 ¹HNMR和 ¹³CNMR表征。光谱分析实验结果显示,探针L对Al³⁺具有高效的选择性识别和抗离子干扰性。Al³⁺浓度在0~12 μmol/L范围内与荧光强度呈现出良好的线性关系,检出限为0.202 μmol/L,远低于我国对饮用水中Al³⁺的限量要求(7.41 μmol/L)。同时,Job曲线证实探针L与Al³⁺以摩尔比1∶1络合,结合常数为7.33×10⁴。以硫酸奎宁为标准参比物质,测得L-Al³⁺配合物在最大荧光激发波长366 nm处的荧光量子产率为5.7%。同时探针L可以对实际水样中的Al³⁺进行检测,表明此探针在检测环境中的Al³⁺方面具有潜在的应用价值。

A novel Schiff base fluorescent probe L is synthesized from isophthalic hydrazide and 2-pyridinecarboxaldehyde,and characterized by means of ¹HNMR and ¹³CNMR.The results from spectral analysis show that probe L is efficient selective and sensitive to Al³⁺.The detection limit of probe L for Al³⁺ is 0.202 μmol·L^-1,which is far lower than China's requirement for the limit value of Al³⁺ content in drinking water (7.41 μmol·L^-1).There is a good linear relationship between the fluorescence intensity of probe L and the concentration of Al³⁺ in the range of 0 to 12 μmol·L^-1.Meanwhile,the Job plot reveals that probe L complexes with Al³⁺ in a molar ratio of 1∶1.Taking quinine sulfate as standard reference material,it is determined that the fluorescence quantum yield of L-Al³⁺ complex is 5.7% at the maximum fluorescence excitation wavelength of 366 nm.At the same time,probe L can detect Al³⁺ in actual water samples,indicating that this probe has potential application value in the detection of Al³⁺ in the environment.

李中燕(1987-),女,硕士,讲师,研究方向为有机合成反应及分子设计。