以荧光素酰肼与5-溴水杨醛反应合成了一种新型荧光素衍生物5-溴水杨醛荧光素腙(BSFH),采用红外、核磁、质谱、元素分析等技术手段对其进行了表征.通过吸收光谱考察了在水溶液中BSFH对常见金属离子的选择性响应,发现BSFH在可见光区几乎无吸收,当加入常见金属离子时,吸收光谱上除了Cu2+之外的其它金属离子在496 nm处出现非常弱的吸收,而当Cu2+存在时,可以裸眼看到溶液颜色迅速从无色变为黄色,吸收光谱上在496 nm处出现了相对很强的吸收峰,并且随着Cu2+浓度的增加溶液的吸收强度不断增强,说明在水溶液中BSFH对Cu2+有很好的选择性.实验结果表明,该化合物与Cu2+的化学计量比为1∶1,Cu2+浓度线性范围为0.30 ～ 10 μmoL/L,许多常见的金属离子不干扰Cu2+的测定,检测限为0.30μmol/L,说明在水溶液中BSFH对铜离子具有很高的灵敏度.据此,BSFH可以简单、快速、灵敏地在水溶液中识别和检测低浓度的铜离子.
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