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采用电子吸收和荧光光谱研究了罗丹明B-5-硝基水杨醛(RhB-NSal)在无水乙腈和醋酸缓冲溶液中对Cu2+离子的识别性能。在两种介质中,RhB-NSal对Cu2+均具有很高的识别性能,仅Fe3+和Bi3+产生一定程度的干扰。RhB-NSal与Cu2+可逆性结合,形成摩尔比为1∶1的配合物,结合常数分别为6.72×104和4.23×104L/mol,对Cu2+的检测限分别为0.49和14.98μmol/L。在含水介质中,RhB-NSal识别Cu2+的灵敏度比在无水乙腈中稍低,但吸收光谱响应依然显著。硝基有助于提高RhB-NSal识别Cu2+的灵敏度,RhB-NSal有望成为Cu2+的荧光增强及可视型识别试剂。
The recognition properties of rhodamine B-5-nitrosalicylaldehyde (RhB-NSal) on Cu2 + ions in anhydrous acetonitrile and acetate buffer solution were studied by electron absorption and fluorescence spectroscopy. In both media, RhB-NSal has a high recognition capacity for Cu2 +, with only some interference from Fe3 + and Bi3 +. RhB-NSal and Cu2 + were reversibly combined to form a 1: 1 molar ratio complex. The binding constants were 6.72 × 104 and 4.23 × 104 L / mol, respectively. The detection limits of Cu2 + were 0.49 and 14.98 μmol / L, respectively. The sensitivity of RhB-NSal to recognize Cu2 + in aqueous media was slightly lower than that in anhydrous acetonitrile, but the absorption spectral response was still significant. Nitro helps to increase the sensitivity of RhB-NSal to recognize Cu2 +, and RhB-NSal is expected to be a fluorescence-enhancing and visual recognition reagent for Cu2 +.