Rhodamine based reusable and colorimetric naked-eye hydrogel sensors for Fe3+ ion

• Rhodamine based monomer.
• Naked-eye hydrogel sensor.
• Reusable hydrogel sensor.
• Colorimetric hydrogel.
• Fe3+ ion separation.

In this study, N-(Rhodamine-6G)lactam-N′-acryloyl-ethylenediamine (RH6GAC) as co-monomer was synthesized in two steps and characterized by FT-IR, 1H, 13C NMR and mass spectrometry. Metal ion (Na+, K+, Ca2+, Fe2+, Fe3+,Co2+, Ni2+, Cu2+, Zn2+, Pb2+, Cd2+, Hg2+, Mn2+, Ba2+, Mg2+) selectivity of RH6GAC was investigated by UV–Vis and fluorescence spectrophotometry. Then, Fe3+ ion selective and reusable naked-eye colorimetric copolymeric sensor hydrogels were synthesized using 2-hydroxyethylmethacrylate (HEMA) and acrylamide (AAm) as the primary monomer and N-(Rhodamine-6G)lactam-N′-acryloyl-ethylenediamine as comonomer by free radical polymerization. The sensor hydrogel was characterized by FT-IR and swelling properties.

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