Synthesis, Characterization And Recognition Performance Of Novel Rhodamine-based Iron(â…¢) And Copper(â…¡) Chemosensors

Objective: Synthesized a series of novel rhodamine-based chemosensors to detect iron(Ⅲ) and copper(Ⅱ) in environmental water sample. Methods: Using rhodamine as parent molecule to react with hydrazinehydrate and ethylenediamine, which then reacted with aromatic aldehyde respectively to obtain a series of chemosensor NDR and chemosensors BR, DBR, NR, AR. Furthermore, IR, 1H NMR, 13 C NMR and single-crystal X-ray diffraction were used to characterize their structures and compositions. At the same time, their recognition performance with 18 metal ions and 8 anions were investigated in EtOH/H2O(1:1, V:V) solution by monitoring the absorption spectral behavior. Results: 5 chemosensors were produced successfully, their recognition performance study showed that NDR could recognized toward iron(Ⅲ) specifically and the color change from colorless to orange red. Meanwhile, BR, DBR,NR and AR could recognized toward copper(Ⅱ) and the color change from colorless to purple red. And more importantly, the resultant complex(BR-Cu2+, DBR-Cu2+, NR-Cu2+ and AR-Cu2+) can as a sequential chemosensor toward S2- among 8 anions in neutral aqueous media. Conclusion: Chemosenors NDR show good specificity to iron(Ⅲ), which can determine iron(Ⅲ) in water sample qualitatively. While chemosensors BR, DBR, NR and AR show good sensitivity and specificity to copper(Ⅱ), which can determine copper(Ⅱ) in water sample qualitatively and quantitatively. It could be conveniently used as colorimetric reagent for determination of Cu2+ or Fe3+ in actual environment with “naked eye”, respectively.