Efficient and selective detection of Co(II) ions has emerged high interest due to their high toxicity that can harm human body and environment if it presents with an excessive level. Therefore, the development of single-ion reactive molecular probes for the fast, selective and efficient detection of Co(II) ions in chemical and biosensor fields is crucial. For the selective colorimetric detection of Co(II) ions, an Azo-Quinoline probe-based imprinted gel sensor has been developed. (E)-2-((4-((8-hydroxyquinolin-5-yl)diazinyl)phenyl)methyl)amino)ethyl acrylate and CoCl2 were combined to form a Cobalt complex with a 1:1 binding stoichiometry. Cobalt complex was reacted with methylenebisacrylamide and 2-hydroxy-2-methlypropiophenone to generate an imprinted gel with UV crosslink at a wavelength of 365 nm. Colorimetric studies show a prominent visual response to Co(II) ions, allowing detection of these ion by using imprinted gels. A reversible study confirmed that the quinoline probe can be used as a secondary sensor for anions by changing the color of the gel from red to orange. This gel also showed a reversibility system in the presence of EDTA2- ion. When Co(II) ions are added to the imprinted gel, the color of the solution changed from orange to red due to the formation of a Co(II)/(E)-2-((4-((8-hydroxyquinolin-5-yl)diazinyl)phenyl)methyl)amino)ethyl acrylate complex, which induced intramolecular charge transfer (ICT) processes.

Imprinted gel of colorimetric water-soluble azo-quinoline probe for detection of sensitive Co(II) ions in aqueous media

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