Two novel phenothiazin‐5‐ium derivatives bearing cyclam moieties (3 a⁺ and 3 b⁺) were synthesized and investigated as Cu²⁺ sensors. Both ligands show intense spectral changes in the presence of Cu²⁺ in aqueous solutions. The high molar extinction coefficient of the chromophore allows both naked eye detection and spectrophotometric quantitative determination of the cation at a micromolar‐concentration scale. 3 a⁺ was found to outperform 3 b⁺, showing negligible spectral changes in the presence of excesses of other metal cations.

中文翻译：

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亚甲基蓝衍生物检测水中的铜（II）。

合成了两个带有环蛋白部分（3a ⁺和3 b ⁺）的新吩噻嗪-5ium衍生物，并将其作为Cu ²⁺传感器进行了研究。在水溶液中存在Cu ^2+时，两种配体均表现出强烈的光谱变化。发色团的高消光系数使得可以在微摩尔浓度范围内用肉眼检测和分光光度法定量阳离子。3 ⁺发现胜过图3b ⁺，示出了其他的金属阳离子的过量的存在可忽略的光谱变化。