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通过罗丹明B与乙二胺反应生成的中间体合成了一例可以对铜离子进行比色检测的探针R-Cu.R-Cu可以实现对在HEPES(5 mmol/L;pH 7.4)溶液中Cu2+的比色可视化识别,加入Cu2+后,R-Cu的吸收明显增强,呈现出罗丹明B的紫红色.探针对Cu2+具有较高的选择性和灵敏性,对其他常见的金属离子具有较强的抗干扰能力.该探针可以在较宽的特别是近中性pH环境下有效检测Cu2+,最低检出限为2.70×10?7 mol/L.
An example of a probe R-Cu for the colorimetric detection of copper ions was synthesized by the reaction of rhodamine B with ethylenediamine. R-Cu can be used as a probe for the colorimetric detection of copper ions in HEPES (5 mmol / L; pH 7.4) Cu2 + visualization of colorimetric identification, the addition of Cu2 +, R-Cu absorption was significantly enhanced, showing the rhodamine B rhodamine B. Probe for Cu2 + has a high selectivity and sensitivity to other common metal ions have more Strong anti-interference ability.The probe can effectively detect Cu2 + in a wide range of especially near-neutral pH environment with the minimum detection limit of 2.70 × 10 -7 mol / L.