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以前设计合成的基于香豆素氨基硫脲衍生物的传感器分子L能在含水介质中单一选择性比色识别铜离子.鉴于铜离子能与氰根离子(CN-)结合形成稳定的配合物,在以前工作基础上,研究了L与铜离子形成的配合物对CN-的连续识别性能.结果表明,L与Cu2+能形成稳定的绿色配合物CuL2,该配合物能专一选择性高灵敏度比色识别水中的CN-.在CuL2的DMSO/H2O(V∶V=3∶1)HEPES(N-2-羟乙基哌嗪-N’-2-乙磺酸)的缓冲体系(pH=7.0)中分别加入F-,Cl-,Br-,I-,AcO-,HSO4-,ClO4-,N3-,SO42-,NO3-,SCN-和CN-等阴离子的水溶液后,只有CN-的加入使得溶液颜色由绿色变为无色,同时在紫外光谱中,CuL2在446 nm处的最大吸收峰消失,这一识别过程不受其它阴离子的干扰.CuL2对CN-的裸眼最低检测限为8.0×10-6mol/L,紫外光谱检测限为4.0×10-7mol/L(0.4μmol·L-1),低于世界卫生组织规定的正常饮用水中CN-的含量标准(<1.9μmol·L-1).结果表明CuL2是一种良好的CN-比色识别受体,在含水介质中对CN-具有选择性好、灵敏度高以及抗干扰强的性能.制备了基于CuL2的CN-检测试纸,该试纸可以方便快捷的检测水中的CN-.
The previously designed and synthesized coumarin thiosemicarbazone derivative-based sensor molecule L can be used to identify copper ions in a single selective colorimetric in aqueous media. Since copper ions can combine with cyanide ions (CN-) to form stable complexes, Based on the previous work, the continuous recognition of CN- by the complex formed by L and copper ions was studied. The results show that L and Cu2 + can form a stable green complex CuL2, which can selectively and sensitively Color recognition of CN- in water Buffer solution of CuL2 in DMSO / H2O (V: V = 3: 1) HEPES (pH = 7.0 ) Were added to the aqueous solution of anions such as F-, Cl-, Br-, I-, AcO-, HSO4-, ClO4-, N3-, SO42-, NO3-, SCN- and CN-, respectively, Making the color of the solution change from green to colorless, while the maximum absorption peak of CuL2 at 446 nm disappears in the UV spectrum, and this recognition process is not disturbed by other anions.CuL2 has the lowest detection limit of naked eye for CN- 10-6mol / L, UV detection limit of 4.0 × 10-7mol / L (0.4μmol·L-1), lower than the normal drinking water in the World Health Organization CN- content standards (<1.9μmol·L- 1). The results show that CuL2 is A good CN-colorimetric recognition receptor, CN-selective, high sensitivity and strong anti-interference performance in aqueous medium prepared CN-detection strip based on CuL2, which can be easily and quickly detected CN- in water.