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设计并合成了3种嘧啶并[1,6-a]苯并咪唑磺化物:4-(2’-羟基苯基)嘧啶并[1,6-a]苯并咪唑-5’-磺酸钠(L1)、4-(2’-羟基苯基)嘧啶并[1,6-a]苯并咪唑-3’,5’,10-三磺酸钠(L2)和4-(2’,4’-二羟基苯基)嘧啶并[1,6-a]苯并咪唑-5’-磺酸钠(L3),运用质谱和核磁等方法对其结构进行表征.运用荧光光谱法考察了L1,L2和L3对Al3+的识别作用,结果表明:在水溶液中L2能与Al3+配合,配合后的荧光光谱强度增强,而加入其它金属离子(Cu2+,Hg2+,K+,Mg2+,Na+,Ni2+,Pb2+,Zn2+,Cr3+,Fe3+)基本没有变化,表明L2对Al3+具有专一的识别性.通过Job’s plot曲线和荧光滴定实验确定L2和Al3+以1∶2的比例进行配合,L2对Al3+的检出限为0.073μmol/L,并且L2能够可视化检测Al3+.
Three pyrimido [1,6-a] benzimidazole sulfonates were designed and synthesized: sodium 4- (2’-hydroxyphenyl) pyrimido [1,6-a] benzimidazole-5’-sulfonate (L1), sodium 4- (2’-hydroxyphenyl) pyrimido [1,6-a] benzimidazole- ’-dihydroxyphenyl) pyrimido [1,6-a] benzimidazole-5’-sodium sulfonate (L3) was synthesized and its structure was characterized by means of mass spectrometry and nuclear magnetic resonance. L2 and L3 on Al3 +. The results showed that L2 could be coordinated with Al3 + in aqueous solution and the intensity of the fluorescence spectrum increased with the addition of other metal ions (Cu2 +, Hg2 +, K +, Mg2 +, Na +, Ni2 +, Pb2 +, Zn2 + , Cr3 +, Fe3 +) showed almost no change, indicating that L2 has a unique recognition of Al3 + .It is determined by Job’s plot curve and fluorescence titration experiments that L2 and Al3 + are combined in a ratio of 1: 2, and the detection limit of L2 to Al3 + is 0.073 μmol / L, and L2 was able to visualize Al3 +.