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The fluorenyl dioxotetraamine L4 was designed and prepared. The solution behavior of L4 and its interaction with the CuII ion were studied by pH potentiometric, fluorimetric and spectrophotometric titration. In the dioxane/water solution, it was found that the molecule L4 showed an “off‐on” or “on‐off” fluorescent response in the absence or presence of the CuII ion with the increase of the pH value...
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