摘要
以2,4-二羟基苯甲醛和二氨基马来腈为原料合成了Schiff碱型荧光分子探针L,采用FT-IR、~1H NMR和MS对其结构进行了表征.结果表明:在V(乙醇)∶V(4-羟乙基哌嗪乙磺酸)=95∶5(pH=7.2)缓冲溶液中,L能够通过off-on荧光响应选择性识别Al~(3+),且几乎不受其他金属离子的干扰.在Al~(3+)浓度为0~2.4×10-5 mol/L时,溶液荧光强度与Al~(3+)浓度呈现良好的线性关系.L对Al~(3+)检出限为6.693×10~(-9)mol/L,二者的络合常数为2.146×10~4(mol/L)~(-1).
In this paper, a Schiff base fluorescent probe L was prepared from 2, 4-dihydroxybenzaldehyde and 2, 3-diaminomaleonitrile. It was characterized by FT-IR,~1H NMR and MS. Subsequently, L was applied as a fluorescent probe for Al~(3+)in ethanol and 4-(2-hydroxyethyl)-1-piperazine ethanesulfonic acid(95 ∶ 5, V/V, p H = 7.2) solution,L displayed an ″ off-on″ recognition ability for Al~(3+)with good selectivity and without obvious disturbances by other metal ions. In the concentration range of Al~(3+)from 0 to 2.4 × 10-5mol/L, the fluorescene intensity of L showed a good linear relationship with the concentration of Al~(3+). The detection limit of L for Al~(3+)is 6.693 × 10-9mol/L and the binding constant between them is 2.146 × 104(mol/L)~(-1).
引文
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