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A quinoxaline–diaminomaleonitrile conjugate system for colorimetric detection of Cu2+ in 100% aqueous medium: observation of aldehyde to acid transformation

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Abstract

In this work, we have strategically incorporated a quinoxaline derivative and a diaminomaleonitrile moiety to construct a chemosensor, 2-amino-3-[(quinoxalin-2-ylmethylene)-amino]-but-2-enedinitrile (H2qm). The notable feature of this strategy is to generate a highly conjugated Schiff base platform with interesting binding properties. Remarkably, H2qm exhibited a visual sensing ability towards Cu2+ in 100% aqueous medium. The effectiveness of the chemosensor has been demonstrated by utilizing it to determine the Cu2+ concentration in real samples. Interestingly, the reaction between H2qm and Cu(ClO4)2·6H2O in DMSO yielded a quinoxaline-2-carboxylic acid based compound and single crystal X-ray diffraction analysis unveiled the resulting structure as [(qa)2Cu(H2O)2] (Hqa = quinoxaline-2-carboxylic acid).

Graphical abstract: A quinoxaline–diaminomaleonitrile conjugate system for colorimetric detection of Cu2+ in 100% aqueous medium: observation of aldehyde to acid transformation

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Publication details

The article was received on 14 Feb 2019, accepted on 25 Mar 2019 and first published on 26 Mar 2019


Article type: Paper
DOI: 10.1039/C9DT00670B
Citation: Dalton Trans., 2019, Advance Article

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    A quinoxaline–diaminomaleonitrile conjugate system for colorimetric detection of Cu2+ in 100% aqueous medium: observation of aldehyde to acid transformation

    R. Bag, Y. Sikdar, S. Sahu, P. Saha, J. Bag, K. Pal and S. Goswami, Dalton Trans., 2019, Advance Article , DOI: 10.1039/C9DT00670B

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