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以3-甲醛基-苯并嗪-2-酮和罗丹明B酰肼为原料,经缩合反应合成一种新型比色探针RC,并利用1HNMR、13CNMR和MS对其进行结构表征。利用紫外-可见紫外光谱法研究了探针RC在乙醇溶液中的金属离子识别性能,该探针在λ=496 nm处对Cu~(2+)和Cd~(2+)发生不同程度的红移,裸眼可观察到明显的颜色变化,而且不受其他离子的干扰。通过Job-plot曲线和Benesi-Hildebrand方程计算出探针RC与Cu~(2+)和Cd~(2+)的物质的量结合比均为1∶1,结合常数K分别为6.44×105和1.17×105,并测得Cu~(2+)和Cd~(2+)的最低检测限分别为5.80×10-6mol和9.19×10-6mol。
A novel colorimetric probe, RC, was synthesized by condensation reaction of 3-carboxaldehyde-benzoxazin-2-one and rhodamine B hydrazide, and its structure was characterized by 1HNMR, 13CNMR and MS. The metal ion recognition properties of probe RC in ethanol solution were investigated by UV-Visible UV spectroscopy. The probe has different degrees of red (Cu 2+ and Cd 2+) emission at λ = 496 nm Move, the naked eye can be observed significant color changes, but also from other ions interference. According to the Job-plot curve and Benesi-Hildebrand equation, the binding ratio of probe RC to Cu 2+ and Cd 2+ was 1: 1, and the binding constants K were 6.44 × 105 and 1.17 × 105, and the detection limits of Cu 2+ and Cd 2+ were 5.80 × 10-6 mol and 9.19 × 10-6 mol respectively.