以间苯二酚为原料合成了一种新型反应型的香豆素二硫缩醛荧光探针（L1），并通过结构确征。在pH 6.15~9.96时，探针L1可以高选择性对Hg²⁺进行荧光检测，检测限低至1.6 nmol/L；同时提出了L1对Hg²⁺的传感机制，并通过核磁研究证实。在紫外线灯下，肉眼可检测到荧光的颜色变化。实际应用研究表明，荧光探针L1能应用于真实水样中Hg²⁺的痕量检测。

A novel reactive 8-(bis(butylthio)methyl)-7-hydroxy-4-methylcoumarin (L1) fluorescent probe is designed and synthesized,and its structure is charaterized.L1 probe shows highly selective fluorescent sensing to Hg²⁺ in the pH range from 6.15 to 9.96 in ethanol/water (v/v=1/1) solution,showing a low detection limit of 1.6 nmol·L^-1.The sensing mechanism of L1 towards Hg²⁺ is proposed and verified by ¹HNMR studies.Under a UV lamp,the fluorescence color changes for L1 can be easily observed by the naked eye.It is verfied by actual application that L1 probe can be applied in the trace detection of Hg²⁺ in real water samples.