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以7-羟基-4-甲基-8-香豆素醛和罗丹明B酰肼为原料,经缩合反应得到可选择性识别Cu2+的比色探针L,并利用1HNMR、MS和元素分析对其结构进行了表征。通过紫外-可见光谱法研究了探针L在缓冲液(V(CH3CN)∶V(Tris-HCl)=1∶1,pH=6.0)中对金属离子的识别能力。随着Cu2+加入,探针L在λ=557 nm处产生强的可见吸收响应,溶液由无色迅速转变为紫红色。在0.6×10-6~1.6×10-6mol/L范围内,Cu2+的浓度与吸光度呈线性关系,最低检测限为6.6×10-8mol/L。探针L与Cu2+形成1∶1型配合物,识别过程可逆。
Using the 7-hydroxy-4-methyl-8-coumarin aldehyde and rhodamine B hydrazide as raw materials, the Cu2 + -based colorimetric probe L was obtained by condensation reaction. The 1H NMR, MS and elemental analysis Its structure was characterized. The ability of the probe L to recognize metal ions in buffer (V (CH3CN): V (Tris-HCl) = 1: 1, pH = 6.0) was studied by UV-Vis spectroscopy. With the addition of Cu2 +, probe L produces a strong visible absorption response at λ = 557 nm, and the solution rapidly changes from colorless to fuchsia. In the range of 0.6 × 10-6 ~ 1.6 × 10-6mol / L, the concentration of Cu2 + has a linear relationship with the absorbance, the minimum detection limit is 6.6 × 10-8mol / L. Probe L forms a 1: 1 complex with Cu2 +, and the recognition process is reversible.