Two novel phenothiazin-5-ium derivatives bearing cyclam moieties (3 a and 3 b ) were synthesized and investigated as Cu sensors. Both ligands show intense spectral changes in the presence of Cu 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.
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