合成了一种新的Zn2+荧光检测试剂8-(2-(十八氨基)乙酰氨基)喹啉(AQZ-18).通过自发荧光的非离子表面活性剂OP-10增溶AQZ-18,获得了一个与Zn2结合后在320 nm和505 nm分别有两个荧光发射峰的溶液体系.短波长荧光峰来自OP-10,荧光峰强度不随Zn2浓度变化；长波长荧光峰来自AQZ-18,荧光峰强度随Zn2+浓度增加而增强.利用上述两个荧光峰强度随Zn2+浓度变化时的比值变化建立了一种新的比率荧光Zn2+检测方法.研究表明,Zn2+与AQZ-18形成1∶1型基态配合物,其表观结合常数为1.1 ×106 L/mol.常见金属离子对Zn2+荧光检测无干扰,Zn2+浓度在0～1.1 ×10-5 mol/L范围内与荧光强度变化的比值呈良好的线性关系,相关系数(r2)为0.996 2,检出限为55 nmol/L.该方法可用于水样中Zn2+的检测.%A novel fluorescent sensor, 8-( 2-( octadecylamino) acetylamino) quinoline ( AQZ-18 ) , was synthesized for sensing Zn2 +. Two fluorescence peaks at 320 nra and 505 nm were observed in the solution of AQZ-18, non-ionic surfactant OP-10 and Zn2+. The shorter wavelength peak arised from autofluorescent OP-10 kept almost unchanged, while the longer wavelength peak produced by AQZ-18 increased gradually with increase of Zn2+ concentrations. Base on this, a new ratiomelric method was established by measuring the ratio variations of fluorescence intensities in the two regions. The 1 : 1 ground state complex between Zn2+ and AQZ-18 was formed, and the apparent association constant was obtained to be 1. 1×106 L/mol. Some common metal ions had no obvious interference for AQZ-18 to detect Zn2+. The ratio of two fluorescence intensities presented a linear relationship with concentration of Zn2+ in the range of 0-1. 1×10 -1 mol/L(r2 =0. 996 2) , with a detection lim-it of 55 nmol/L. The method could be used for the delermination of Zn2+ in water samples.
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